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185-480: Otto Hahn ( pronounced [ˈɔtoː ˈhaːn] ; 8 March 1879 – 28 July 1968) was a German chemist who was a pioneer in the fields of radioactivity and radiochemistry . He is referred to as the father of nuclear chemistry and discoverer of nuclear fission , the science behind nuclear reactors and nuclear weapons . Hahn and Lise Meitner discovered isotopes of the radioactive elements radium , thorium , protactinium and uranium . He also discovered

370-815: A Master of Science or a Doctor of Philosophy (PhD.). Most undergraduate programs emphasize mathematics and physics as well as chemistry, partly because chemistry is also known as " the central science ", thus chemists ought to have a well-rounded knowledge about science. At the Master's level and higher, students tend to specialize in a particular field. Fields of specialization include biochemistry , nuclear chemistry , organic chemistry , inorganic chemistry , polymer chemistry , analytical chemistry , physical chemistry , theoretical chemistry , quantum chemistry , environmental chemistry , and thermochemistry . Postdoctoral experience may be required for certain positions. Workers whose work involves chemistry, but not at

555-628: A Privatdozent . A thesis was not required; the Chemical Institute accepted one of his publications on radioactivity instead. Most of the organic chemists at the Chemical Institute did not regard Hahn's work as real chemistry. Fischer objected to Hahn's contention in his habilitation colloquium that many radioactive substances existed in such tiny amounts that they could only be detected by their radioactivity, venturing that he had always been able to detect substances with his keen sense of smell, but soon gave in. One department head remarked: "it

740-469: A hydrofluoric acid solution with tantalic acid . First the tantalum in the ore was precipitated, then the protactinium. In addition to the uranium X1 (thorium-234) and uranium X2 (protactinium-234), Hahn detected traces of a radioactive substance with a half-life of between 6 and 7 hours. There was one isotope known to have a half-life of 6.2 hours, mesothorium II (actinium-228). This was not in any probable decay chain, but it could have been contamination, as

925-406: A radioactive recoil in 1904, but interpreted it wrongly. Hahn and Meitner succeeded in demonstrating the radioactive recoil incident to alpha particle emission and interpreted it correctly. Hahn pursued a report by Stefan Meyer and Egon Schweidler of a decay product of actinium with a half-life of about 11.8 days. Hahn determined that it was actinium X ( radium-223 ). He also discovered that at

1110-817: A M.S. as professors too (and rarely, some big universities who need part-time or temporary instructors, or temporary staff), but when the positions are scarce and the applicants are many, they might prefer Ph.D. holders instead. Skills that a chemist may need on the job include: Most chemists begin their lives in research laboratories . Many chemists continue working at universities. Other chemists may start companies, teach at high schools or colleges, take samples outside (as environmental chemists ), or work in medical examiner offices or police departments (as forensic chemists ). Some software that chemists may find themselves using include: Increasingly, chemists may also find themselves using artificial intelligence , such as for drug discovery . Chemistry typically

1295-403: A Master of Science (M.S.) in chemistry or in a very related discipline may find chemist roles that allow them to enjoy more independence, leadership and responsibility earlier in their careers with less years of experience than those with a bachelor's degree as highest degree. Sometimes, M.S. chemists receive more complex tasks duties in comparison with the roles and positions found by chemists with

1480-559: A Ph.D. more often than not. Chemists with a Ph.D. as the highest academic degree are found typically on the research-and-development department of an enterprise and can also hold university positions as professors. Professors for research universities or for big universities usually have a Ph.D., and some research-oriented institutions might require post-doctoral training. Some smaller colleges (including some smaller four-year colleges or smaller non-research universities for undergraduates) as well as community colleges usually hire chemists with

1665-515: A State of Emergency") and the labour unions . Demonstrations and protests grew in number, and in 1967 the student Benno Ohnesorg was shot in the head by a policeman. The press, especially the tabloid Bild-Zeitung newspaper, launched a campaign against the protesters. By 1968, a stronger desire to confront the Nazi past had come into being. In the 1970s environmentalism and anti-nationalism became fundamental values among left-wing Germans. As

1850-604: A bachelor's degree are most commonly involved in positions related to either research assistance (working under the guidance of senior chemists in a research-oriented activity), or, alternatively, they may work on distinct (chemistry-related) aspects of a business, organization or enterprise including aspects that involve quality control, quality assurance, manufacturing, production, formulation, inspection, method validation, visitation for troubleshooting of chemistry-related instruments, regulatory affairs , "on-demand" technical services, chemical analysis for non-research purposes (e.g., as

2035-466: A bachelor's degree as their highest academic degree and with the same or close-to-same years of job experience. There are positions that are open only to those that at least have a degree related to chemistry at the master's level. Although good chemists without a Ph.D. degree but with relatively many years of experience may be allowed some applied research positions, the general rule is that Ph.D. chemists are preferred for research positions and are typically

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2220-764: A book in English (and later in Russian) titled Applied Radiochemistry , which contained the lectures given by Hahn when he was a visiting professor at Cornell University in Ithaca, New York , in 1933. This publication had a major influence on almost all nuclear chemists and physicists in the United States, the United Kingdom, France, and the Soviet Union during the 1930s and 1940s. Hahn is referred to as

2405-481: A bright future, and that someone who had discovered a new radioactive element should go to the University of Berlin . Ramsay wrote to Emil Fischer , the head of the chemistry institute there, who replied that Hahn could work in his laboratory, but could not be a Privatdozent because radiochemistry was not taught there. At this point, Hahn decided that he first needed to know more about the subject, so he wrote to

2590-541: A caretaker. However, he ruled for 14 years. The grand statesman of German postwar politics had to be dragged—almost literally—out of office in 1963. In October 1962 the weekly news magazine Der Spiegel published an analysis of the West German military defence. The conclusion was that there were several weaknesses in the system. Ten days after publication, the offices of Der Spiegel in Hamburg were raided by

2775-429: A cloud of arsenicals . In 1913, chemists Frederick Soddy and Kasimir Fajans independently observed that alpha decay caused atoms to move down two places on the periodic table , while the loss of two beta particles restored it to its original position. Under the resulting reorganisation of the periodic table, radium was placed in group II, actinium in group III, thorium in group IV and uranium in group VI. This left

2960-562: A coalition would be far from a majority. Neither condition changed until 1998. Denazification was an Allied initiative to rid German politics, judiciary, society, culture, press and economy of Nazi ideology and personnel following the Second World War . It was carried out by removing those who had been Nazi Party or SS members from positions of power and influence, by disbanding the organizations associated with Nazism, and by trying prominent Nazis for war crimes . The program

3145-435: A combination of education, experience and personal achievements), the higher the responsibility given to that chemist and the more complicated the task might be. Chemistry, as a field, have so many applications that different tasks and objectives can be given to workers or scientists with these different levels of education or experience. The specific title of each job varies from position to position, depending on factors such as

3330-458: A complex mix of half-lives. Fermi therefore concluded that the new elements with atomic numbers greater than 92 (known as transuranium elements ) had been created. Meitner and Hahn had not collaborated for many years, but Meitner was eager to investigate Fermi's results. Hahn, initially, was not, but he changed his mind when Aristid von Grosse suggested that what Fermi had found was an isotope of protactinium. They set out to determine whether or not

3515-410: A complexity requiring an education with a chemistry degree, are commonly referred to as chemical technicians . Such technicians commonly do such work as simpler, routine analyses for quality control or in clinical laboratories , having an associate degree . A chemical technologist has more education or experience than a chemical technician but less than a chemist, often having a bachelor's degree in

3700-410: A compound of thorium X and stupidity. Boltwood was soon convinced that it did exist, although he and Hahn differed on what its half-life was. William Henry Bragg and Richard Kleeman had noted that the alpha particles emitted from radioactive substances always had the same energy, providing a second way of identifying them, so Hahn set about measuring the alpha particle emissions of radiothorium. In

3885-524: A country identifier, extending the postal code and as the Internet's country code top-level domain .de . The less widely used ISO 3166-1 alpha-3 country code of West Germany was DEU, which has remained the country code of reunified Germany. The now deleted codes for East Germany, on the other hand, were DD in ISO 3166-1 alpha-2 and DDR in ISO 3166-1 alpha-3. The colloquial term West Germany or its equivalent

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4070-409: A different field of science with also an associate degree in chemistry (or many credits related to chemistry) or having the same education as a chemical technician but more experience. There are also degrees specific to become a chemical technologist, which are somewhat distinct from those required when a student is interested in becoming a professional chemist. A Chemical technologist is more involved in

4255-526: A dissertation entitled "On Bromine Derivates of Isoeugenol", a topic in classical organic chemistry . He completed his one-year military service (instead of the usual two because he had a doctorate) in the 81st Infantry Regiment, but unlike his brothers, did not apply for a commission. He then returned to the University of Marburg, where he worked for two years as assistant to his doctoral supervisor, Geheimrat professor Theodor Zincke . Hahn's intention

4440-503: A doctorate from the University of Vienna , and had already published two papers on radioactivity. Rubens suggested her as a possible collaborator. So began the thirty-year collaboration and lifelong close friendship between the two scientists. In Montreal, Hahn had worked with physicists including at least one woman, Harriet Brooks , but it was difficult for Meitner at first. Women were not yet admitted to universities in Prussia . Meitner

4625-555: A former woodworking shop in the basement of the Chemical Institute at the University of Berlin as a laboratory. Hahn completed his habilitation in early 1907 and became a Privatdozent . In 1912, he became head of the Radioactivity Department of the newly founded Kaiser Wilhelm Institute for Chemistry (KWIC). Working with the Austrian physicist Lise Meitner in the building that now bears their names, they made

4810-420: A gap between thorium and uranium. Soddy predicted that this unknown element, which he referred to (after Dmitri Mendeleev ) as "ekatantalium", would be an alpha emitter with chemical properties similar to tantalium . It was not long before Fajans and Oswald Helmuth Göhring discovered it as a decay product of a beta-emitting product of thorium. Based on the radioactive displacement law of Fajans and Soddy , this

4995-517: A gas (generally called an emanation), identical with the radioactive emanation from thorium. Another theory of deep interest is that it is the possible source of a radioactive element possibly stronger in radioactivity than radium itself, and capable of producing all the curious effects which are known of radium up to the present. – The discoverer read a paper on the subject to the Royal Society last week, and this should rank, when published, among

5180-542: A group 2 metal was problematic, because it did not logically fit with the other elements found thus far. Hahn initially suspected it to be radium, produced by splitting off two alpha-particles from the uranium nucleus, but chipping off two alpha particles via this process was unlikely. The idea of turning uranium into barium (by removing around 100 nucleons) was seen as preposterous. During a visit to Copenhagen on 10 November, Hahn discussed these results with Niels Bohr , Meitner, and Otto Robert Frisch . Further refinements of

5365-435: A half life of 1.7 minutes, Hahn and Meitner's isotope had one of 32,500 years. The name brevium no longer seemed appropriate. Fajans agreed to Meitner and Hahn naming the element " protoactinium ". In June 1918, Soddy and John Cranston announced that they had extracted a sample of the isotope, but unlike Hahn and Meitner were unable to describe its characteristics. They acknowledged Hahn´s and Meitner's priority, and agreed to

5550-634: A leading FDP official, became Vice Chancellor and Foreign Minister. Schmidt, a strong supporter of the European Community (EC) and the Atlantic alliance, emphasized his commitment to "the political unification of Europe in partnership with the USA". Mounting external problems forced Schmidt to concentrate on foreign policy and limited the domestic reforms that he could carry out. The USSR upgraded its intermediate-range missiles, which Schmidt complained

5735-507: A legal request, for testing purposes, or for government or non-profit agencies); chemists may also work in environmental evaluation and assessment. Other jobs or roles may include sales and marketing of chemical products and chemistry-related instruments or technical writing. The more experience obtained, the more independence and leadership or management roles these chemists may perform in those organizations. Some chemists with relatively higher experience might change jobs or job position to become

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5920-872: A major role in drafting the antisemitic Nuremberg Race Laws in Nazi Germany. In 1957, 77% of the West German Ministry of Justice 's senior officials were former Nazi Party members. In West Germany, most of the political agencies and buildings were located in Bonn, while the German Stock Market was located in Frankfurt which became the economic center. The judicial branch of both the German Federal Constitutional Court ( Bundesverfassungsgericht ) and

6105-468: A manager of a chemistry-related enterprise, a supervisor, an entrepreneur or a chemistry consultant. Other chemists choose to combine their education and experience as a chemist with a distinct credential to provide different services (e.g., forensic chemists, chemistry-related software development, patent law specialists, environmental law firm staff, scientific news reporting staff, engineering design staff, etc.). In comparison, chemists who have obtained

6290-781: A member of the subsequently founded Warsaw Pact . The former capital, Berlin , had been divided into four sectors, with the Western Allies joining their sectors to form West Berlin , while the Soviets held East Berlin . West Berlin was completely surrounded by East German territory and had suffered a Soviet blockade in 1948–49, which was overcome by the Berlin airlift . The outbreak of the Korean War in June 1950 led to U.S. calls to rearm West Germany to help defend Western Europe from

6475-624: A member. Following the collapse of the Eastern Bloc , symbolised by the opening of the Berlin Wall , both states took action to achieve German reunification . East Germany voted to dissolve and accede to the Federal Republic of Germany in 1990. The five post-war states ( Länder ) were reconstituted, along with the reunited Berlin , which ended its special status and formed an additional Land . They formally joined

6660-769: A memorial to the Warsaw Ghetto Uprising crushed by the Germans, Brandt unexpectedly knelt and meditated in silence, a moment remembered as the Kniefall von Warschau . Brandt resigned as chancellor in 1974, after Günter Guillaume , one of his closest aides, was exposed as an agent of the Stasi , the East German secret service . Finance Minister Helmut Schmidt (SPD) formed a coalition and he served as Chancellor from 1974 to 1982. Hans-Dietrich Genscher ,

6845-478: A new class of reaction and the alpha decay of uranium, neither of which had ever been reported before, and for which physical evidence was lacking. Hahn and Strassmann refined their chemical procedures, while Meitner devised new experiments to shine more light on the reaction processes. In May 1937, they issued parallel reports, one in the Zeitschrift für Physik with Meitner as the principal author, and one in

7030-586: A new generation of teachers, educated with the findings of historical studies, could begin to reveal the truth about the war and the crimes committed in the name of the German people, one courageous attorney, Fritz Bauer patiently gathered evidence on the guards of the Auschwitz concentration camp and about twenty were put on trial in Frankfurt in 1963. Daily newspaper reports and visits by school classes to

7215-622: A result, in 1979 the Greens were able to reach the 5% minimum required to obtain parliamentary seats in the Free Hanseatic City of Bremen state election, and with the foundation of the national party in 1980 developed into one of the most politically successful green movements in the world. Another result of the unrest in the 1960s was the founding of the Red Army Faction (RAF). The RAF was active from 1968, carrying out

7400-642: A series of groundbreaking discoveries, culminating with her isolation of the longest-lived isotope of protactinium in 1918. During World War I he served with a Landwehr regiment on the Western Front , and with the chemical warfare unit headed by Fritz Haber on the Western, Eastern and Italian fronts, earning the Iron Cross (2nd Class) for his part in the First Battle of Ypres . After

7585-541: A site where the Italian trenches were sheltered in a deep valley so that a gas cloud would persist. The following Battle of Caporetto broke the Italian lines, and the Central Powers overran much of northern Italy. That summer Hahn was accidentally poisoned by phosgene while testing a new model of gas mask. At the end of the war he was in the field in mufti on a secret mission to test a pot that heated and released

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7770-633: A sovereign state" on 5 May 1955 (although "full sovereignty" was not obtained until the Two Plus Four Agreement in 1990). The former occupying Western troops remained on the ground, now as part of the North Atlantic Treaty Organization (NATO), which West Germany joined on 9 May 1955, promising to rearm itself soon. West Germany became a focus of the Cold War with its juxtaposition to East Germany ,

7955-587: A special nose for discovering new elements." In 1906, Hahn returned to Germany, where Fischer placed at his disposal a former woodworking shop ( Holzwerkstatt ) in the basement of the Chemical Institute to use as a laboratory. Hahn equipped it with electroscopes to measure alpha and beta particles and gamma rays . In Montreal these had been made from discarded coffee tins; Hahn made the ones in Berlin from brass, with aluminium strips insulated with amber. These were charged with hard rubber sticks that he rubbed against

8140-458: A special performance. Supporters of the Shah (later known as Jubelperser ), armed with staves and bricks attacked the protesters while the police stood by and watched. A demonstration in the centre was being forcibly dispersed when a bystander named Benno Ohnesorg was shot in the head and killed by a plainclothes policeman. (It has now been established that the policeman, Kurras, was a paid spy of

8325-602: A succession of terrorist attacks in West Germany during the 1970s. Even in the 1990s, attacks were still being committed under the name RAF . The last action took place in 1993, and in 1998 the group announced it was ceasing activities. In the 1969 election, the SPD gained enough votes to form a coalition government with the FDP. SPD leader and Chancellor Willy Brandt remained head of government until May 1974, when he resigned after

8510-496: A very different note to Hahn, reporting that: Also miissen die ProzesSe Einfangprozesse des Uran 238 sein, was zu drei isomeren Kernen Uran 239 fiihrt. Dieses Ergebnis ist mit den bisherigen Kernvorstellungen sehr schwer in Ubereinstimmung zu bringen ("The process must be neutron capture by uranium-238, which leads to three isomeric nuclei of uranium-239. This result is very difficult to reconcile with current concepts of

8695-539: A whole despite the Soviets declaring the end of occupation of East Berlin unilaterally many decades before). The Two-plus-Four Agreement also saw the two parts of Germany confirm their post-war external boundaries as final and irreversible (including the 1945 transfer of former German lands east of the Oder–Neisse line ), and the Allied Powers confirmed their consent to German Reunification. From 3 October 1990, after

8880-461: Is derived from the Neo-Latin noun chimista , an abbreviation of alchimista ( alchemist ). Alchemists discovered many chemical processes that led to the development of modern chemistry. Chemistry as we know it today, was invented by Antoine Lavoisier with his law of conservation of mass in 1783. The discoveries of the chemical elements has a long history culminating in the creation of

9065-1094: Is divided into several major sub-disciplines. There are also several main cross-disciplinary and more specialized fields of chemistry. There is a great deal of overlap between different branches of chemistry, as well as with other scientific fields such as biology, medicine, physics, radiology , and several engineering disciplines. All the above major areas of chemistry employ chemists. Other fields where chemical degrees are useful include astrochemistry (and cosmochemistry ), atmospheric chemistry , chemical engineering , chemo-informatics , electrochemistry , environmental science , forensic science , geochemistry , green chemistry , history of chemistry , materials science , medical science , molecular biology , molecular genetics , nanotechnology , nuclear chemistry , oenology , organometallic chemistry , petrochemistry , pharmacology , photochemistry , phytochemistry , polymer chemistry , supramolecular chemistry and surface chemistry . Chemists may belong to professional societies specifically for professionals and researchers within

9250-475: Is incredible what one gets to be a Privatdozent these days!" Physicists were more accepting of Hahn's work, and he began attending a colloquium at the Physics Institute conducted by Heinrich Rubens . It was at one of these colloquia where, on 28 September 1907, he made the acquaintance of the Austrian physicist Lise Meitner . Almost the same age as himself, she was only the second woman to receive

9435-608: Is sometimes known as the Bonn Republic (German: Bonner Republik ) after its capital city of Bonn . During the Cold War , the western portion of Germany and the associated territory of West Berlin were parts of the Western Bloc . West Germany was formed as a political entity during the Allied occupation of Germany after World War II , established from 12 states formed in the three Allied zones of occupation held by

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9620-633: The Deutsche Demokratische Republik (DDR; German Democratic Republic; commonly known as East Germany). Reunification was achieved by accession ( Beitritt ) of the German Democratic Republic to the Federal Republic of Germany, so Bundesrepublik Deutschland became the official name of reunified Germany. In East Germany, the terms Westdeutschland (West Germany) or westdeutsche Bundesrepublik (West German Federal Republic) were preferred during

9805-476: The Chemische Berichte with Hahn as the principal author. Hahn concluded his by stating emphatically: Vor allem steht ihre chemische Verschiedenheit von allen bisher bekannten Elementen außerhalb jeder Diskussion ("Above all, their chemical distinction from all previously known elements needs no further discussion"). Meitner, however, was increasingly uncertain. She considered the possibility that

9990-514: The Battle of Bolimów on 12 June 1915, they released a mixture of chlorine and phosgene gas. Some German troops were reluctant to advance when the gas started to blow back, so Hahn led them across No Man's land . He witnessed the death agonies of Russians they had poisoned, and unsuccessfully attempted to revive some with gas masks. He was transferred to Berlin as a human guinea pig testing poisonous gases and gas masks. On their next attempt on 7 July,

10175-633: The Guillaume affair , in which a senior member of his staff was uncovered as a spy for the East German intelligence service, the Stasi . However, the affair is widely considered to have been merely a trigger for Brandt's resignation, not a fundamental cause. Instead, Brandt, dogged by scandal relating to alcohol and depression as well as the economic fallout of the 1973 oil crisis , almost seems simply to have had enough. As Brandt himself later said, "I

10360-650: The London and Paris Conferences , the Brussels Treaty was modified to include West Germany, and to form the Western European Union (WEU). West Germany was to be permitted to rearm (an idea many Germans rejected), and have full sovereign control of its military, called the Bundeswehr . The WEU, however, would regulate the size of the armed forces permitted to each of its member states. Also,

10545-486: The Red Brigades ( Brigate Rosse ), many students went to work in the factories, but with little or no success. The most notorious of the underground groups was the Red Army Faction which began by making bank raids to finance their activities and eventually went underground having killed a number of policemen, several bystanders and eventually two prominent West Germans, whom they had taken captive in order to force

10730-635: The Republic of Baden , which had derived ultimately from former independent German kingdoms and principalities. In the dominant post-war narrative of West Germany, the Nazi regime was characterised as having been a 'criminal' state, illegal and illegitimate from the outset; while the Weimar Republic was characterised as having been a 'failed' state, whose inherent institutional and constitutional flaws had been exploited by Hitler in his illegal seizure of dictatorial powers. Consequently, following

10915-609: The Saarland joined West Germany as a state in 1957 after it had been separated as the Saar Protectorate from Allied-occupied Germany by France (the separation had been not legal as it had not been recognized by the Allied Control Council ). In addition to the resulting ten states, West Berlin was considered an unofficial de facto eleventh state. While de jure not part of West Germany, for Berlin

11100-570: The Society of German Chemists when it became part of the Nazi German Labour Front . As a result, he could neither work in the chemical industry nor receive his habilitation, the prerequisite for an academic position. Meitner persuaded Hahn to hire Strassmann as an assistant. Soon he would be credited as a third collaborator on the papers they produced, and would sometimes even be listed first. Hahn spent February to June 1933 in

11285-744: The University of Marburg . His subsidiary subjects were mathematics, physics , mineralogy and philosophy. Hahn joined the Students' Association of Natural Sciences and Medicine, a student fraternity and a forerunner of today's Landsmannschaft Nibelungi ( Coburger Convent der akademischen Landsmannschaften und Turnerschaften ). He spent his third and fourth semesters at the University of Munich , studying organic chemistry under Adolf von Baeyer , physical chemistry under Wilhelm Muthmann  [ de ] , and inorganic chemistry under Karl Andreas Hofmann . In 1901, Hahn received his doctorate in Marburg for

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11470-481: The atomic nucleus more easily than protons or alpha particles. Enrico Fermi and his colleagues in Rome picked up on this idea, and began irradiating elements with neutrons. The radioactive displacement law of Fajans and Soddy said that beta decay causes isotopes to move one element up on the periodic table, and alpha decay causes them to move two down. When Fermi's group bombarded uranium atoms with neutrons, they found

11655-581: The co-precipitation of minute quantities of radioactive materials when insoluble substances were precipitated from aqueous solutions. I recall reading and rereading every word in these laws of co-precipitation many times, attempting to derive every possible bit of guidance for our work, and perhaps in my zealousness reading into them more than the master himself had intended. I doubt that I have read sections in any other book more carefully or more frequently than those in Hahn's Applied Radiochemistry . In fact, I read

11840-609: The periodic table by Dmitri Mendeleev . The Nobel Prize in Chemistry created in 1901 gives an excellent overview of chemical discovery since the start of the 20th century. At the Washington Academy of Sciences during World War I , it was said that the side with the best chemists would win the war. Jobs for chemists generally require at least a bachelor's degree in chemistry, which takes four years. However, many positions, especially those in research, require

12025-475: The "Two-plus-Four Agreement"); by which transitional status of Germany following World War II was definitively ended and the Four Allied powers relinquished their joint residual sovereign authority for Germany as a whole including the area of West Berlin which had officially remained under Allied occupation for the purposes of international and GDR law (a status that the Western countries applied to Berlin as

12210-686: The 'overall' German state that was held to have embodied the unified German people since the Frankfurt Parliament of 1848, and which from 1871 had been represented within the German Reich ; albeit that this overall state had become effectively dormant long before 8 May 1945. In 1949 with the continuation and aggravation of the Cold War (for example, the Berlin Airlift of 1948–49), the two German states that had originated in

12395-509: The 13-minute isotope was indeed an isotope of protactinium. Between 1934 and 1938, Hahn, Meitner and Strassmann found a great number of radioactive transmutation products, all of which they regarded as transuranic. At that time, the existence of actinides was not yet established, and uranium was wrongly believed to be a group 6 element similar to tungsten . It followed that the first transuranic elements would be similar to group 7 to 10 elements, i.e. rhenium and platinoids . They established

12580-444: The 1950s and 1960s. This changed under its constitutional amendment in 1974, when the idea of a single German nation was abandoned by East Germany. As a result, it officially considered West Germans and West Berliners as foreigners. The initialism BRD (FRG in English) began to prevail in East German usage in the early 1970s, beginning in the newspaper Neues Deutschland . Other Eastern Bloc nations soon followed suit. In 1965,

12765-452: The 2015 Hague Ethical Guidelines . The highest honor awarded to chemists is the Nobel Prize in Chemistry , awarded since 1901, by the Royal Swedish Academy of Sciences . West Germany in Europe  (dark grey) in Europe  (dark grey) West Germany is the common English name for the Federal Republic of Germany from its formation on 23 May 1949 until its reunification with East Germany on 3 October 1990. It

12950-423: The Allies stationed troops within West Germany for NATO defense, pursuant to stationing and status-of-forces agreements. With the exception of 55,000 French troops, Allied forces were under NATO's joint defense command. (France withdrew from the collective military command structure of NATO in 1966.) Konrad Adenauer was 73 years old when he became chancellor in 1949, and for this reason he was initially reckoned as

13135-433: The Atlantic alliance, emphasized his commitment to "the political unification of Europe in partnership with the USA". The goals of SPD and FDP however drifted apart in the late 1970s and early 1980s. On 1 October 1982 the FDP joined forces with the CDU/CSU to elect CDU Chairman Helmut Kohl as Chancellor in a constructive vote of no confidence . Following national elections in March 1983, Kohl emerged in firm control of both

13320-521: The Auschwitz trial reverberated decades later. The calling in question of the actions and policies of government led to a new climate of debate. The issues of emancipation, colonialism, environmentalism and grass roots democracy were discussed at all levels of society. In 1979 the environmental party, the Greens, reached the 5% limit required to obtain parliamentary seats in the Free Hanseatic City of Bremen provincial election. Also of great significance

13505-671: The EDC while maintaining independent control of their own armed forces. Though the EDC treaty was signed (May 1952), it never entered into force. France's Gaullists rejected it on the grounds that it threatened national sovereignty, and when the French National Assembly refused to ratify it (August 1954), the treaty died. The French Gaullists and communists had killed the French government's proposal. Then other means had to be found to allow West German rearmament. In response, at

13690-581: The East German security forces.) Protest demonstrations continued, and calls for more active opposition by some groups of students were made, which was declared by the press, especially the tabloid Bild -Zeitung newspaper, as a massive disruption to life in Berlin, in a massive campaign against the protesters. Protests against the US intervention in Vietnam , mingled with anger over the vigour with which demonstrations were repressed led to mounting militance among

13875-504: The Federal Republic on 3 October 1990, raising the number of states from 10 to 16, ending the division of Germany. The expanded Federal Republic retained West Germany's political culture and continued its existing memberships in international organisations, as well as its Western foreign policy alignment and affiliation to Western alliances like NATO and the European Union. The official German reunification ceremony on 3 October 1990

14060-516: The Federal Republic subject to the terms of the Unification Treaty between the two states; and then both West Germany and East Germany radically amended their respective constitutions in accordance with that Treaty's provisions. East Germany then dissolved itself, and its five post-war states ( Länder ) were reconstituted, along with the reunited Berlin which ended its special status and formed an additional Land . They formally joined

14245-572: The Free Democratic Party (FDP) in order to lay the groundwork for an eventual return to power. Although this effort was exposed and disrupted, many former Nazis still attained positions of power and influence in the political system. West German President (1974–1979) Walter Scheel and Chancellor (1966–1969) Kurt Georg Kiesinger were both former members of the Nazi Party. Konrad Adenauer's State Secretary Hans Globke had played

14430-715: The German Democratic Republic. The expanded Federal Republic retained West Germany's political culture and continued its existing memberships in international organisations, as well as its Western foreign policy alignment and affiliation to Western alliances such as the United Nations, NATO, OECD , and the European Economic Community . Before reunification, Germany was divided between the Bundesrepublik Deutschland (Federal Republic of Germany; commonly known as West Germany) and

14615-402: The German constitution prohibited any military action, except in the case of an external attack against Germany or its allies ( Bündnisfall ). Also, Germans could reject military service on grounds of conscience, and serve for civil purposes instead. The three Western Allies retained occupation powers in Berlin and certain responsibilities for Germany as a whole. Under the new arrangements,

14800-504: The International Union of Pure and Applied Chemistry ( IUPAC ) named the new element definitively protactinium, and confirmed Hahn and Meitner as discoverers. With the discovery of protactinium, most of the decay chains of uranium had been mapped. When Hahn returned to his work after the war, he looked back over his 1914 results, and considered some anomalies that had been dismissed or overlooked. He dissolved uranium salts in

14985-538: The KWI for Chemistry's party steward ( Vertrauensmann ). While Hahn was in North America in 1905–1906, his attention had been drawn to a mica-like mineral from Manitoba that contained rubidium . He had studied the radioactive decay of rubidium-87 , and had estimated its half-life at 2 x 10 years. It occurred to him that by comparing the quantity of strontium in the mineral (which had once been rubidium) with that of

15170-424: The KWI for Chemistry. Hahn therefore did not have to fire any of his own full-time staff, but as the interim director of Haber's institute, he dismissed a quarter of its staff, including three department heads. Gerhart Jander was appointed the new director of Haber's old institute, and reoriented it towards chemical warfare research. Like most KWS institute directors, Haber had accrued a large discretionary fund. It

15355-451: The KWICy had experimented with it. Hahn and Meitner demonstrated in 1919 that when actinium is treated with hydrofluoric acid, it remains in the insoluble residue. Since mesothorium II was an isotope of actinium, the substance was not mesothorium II; it was protactinium. Hahn was now confident enough he had found something that he named his new isotope "uranium Z". In February 1921, he published

15540-468: The Nobel Prize in Chemistry by Bernhard Naunyn , Goldschmidt and Planck. As a young graduate student at the University of California at Berkeley in the mid-1930s and in connection with our work with plutonium a few years later, I used his book Applied Radiochemistry as my bible. This book was based on a series of lectures which Professor Hahn had given at Cornell in 1933; it set forth the "laws" for

15725-489: The State Counsel Siegfried Buback . In October 1969 Willy Brandt became chancellor. He maintained West Germany's close alignment with the United States and focused on strengthening European integration in western Europe, while launching the new policy of Ostpolitik aimed at improving relations with Eastern Europe. Brandt was controversial on both the right wing, for his Ostpolitik , and on

15910-482: The United States and Canada as a visiting professor at Cornell University. He gave an interview to the Toronto Star Weekly in which he painted a flattering portrait of Adolf Hitler : I am not a Nazi. But Hitler is the hope, the powerful hope, of German youth... At least 20 million people revere him. He began as a nobody, and you see what he has become in ten years.… In any case for the youth, for

16095-516: The United States, the United Kingdom, and France. At the onset of the Cold War, Europe was divided between the Western and Eastern blocs . Germany was divided into the two countries. Initially, West Germany claimed an exclusive mandate for all of Germany, representing itself as the sole democratically reorganised continuation of the 1871–1945 German Reich . Three southwestern states of West Germany merged to form Baden-Württemberg in 1952, and

16280-603: The West German Federal Minister of All-German Affairs , Erich Mende , had issued the "Directives for the Appellation of Germany", recommending avoiding the initialism BRD. On 31 May 1974, the heads of West German federal and state governments recommended always using the full name in official publications. From then on, West German sources avoided the abbreviated form, with the exception of left-leaning organizations which embraced it. In November 1979,

16465-777: The Western Allied and the Soviet Zones respectively became known internationally as West Germany and East Germany. Commonly known in English as East Germany , the former Soviet occupation zone in Germany , eventually became the German Democratic Republic or GDR . In 1990 West Germany and East Germany jointly signed the Treaty on the Final Settlement with Respect to Germany (also known as

16650-415: The age of 15, he began to take a special interest in chemistry, and carried out simple experiments in the laundry room of the family home. His father wanted Otto to study architecture, as he had built or acquired several residential and business properties, but Otto persuaded him that his ambition was to become an industrial chemist . In 1897, after passing his Abitur , Hahn began to study chemistry at

16835-457: The boundaries of Germany as at 31 December 1937 would be chosen as demarcating German national territory from German-occupied territory; all German annexations after 1937 were automatically null. Subsequently, and into the 1970s, the West German state was to maintain that these 1937 boundaries continued to be 'valid in international law', although the Allies had already agreed amongst themselves that

17020-635: The case of the territory of Kaliningrad) civil administration, their Polish and Soviet status to be confirmed at a final Peace Treaty. Following wartime commitments by the Allies to the governments-in-exile of Czechoslovakia and Poland, the Potsdam Protocols also agreed to the 'orderly and humane' transfer to Germany as a whole of the ethnic German populations in Poland, Czechoslovakia and Hungary. Eight million German expellees and refugees eventually settled in West Germany. Between 1946 and 1949, three of

17205-542: The court that they regarded their action as a legitimate act in what they described as the "struggle against imperialism". The student movement began to split into different factions, ranging from the unattached liberals to the Maoists and supporters of direct action in every form—the anarchists. Several groups set as their objective the aim of radicalising the industrial workers and taking an example from activities in Italy of

17390-555: The death of Hitler in 1945 and the subsequent capitulation of the German Armed Forces, the national political, judicial, administrative, and constitutional instruments of both Nazi Germany and the Weimar Republic were understood as entirely defunct, such that a new West Germany could be established in a condition of constitutional nullity. Nevertheless, the new West Germany asserted its fundamental continuity with

17575-506: The department heads that Hahn had dismissed, who was now working in England. Ernst Telschow  [ de ] , a Nazi Party member, was in charge while Planck, the president of the KWS since 1930, was on vacation, and he ordered the shipment halted. Hahn complied, but he disgreed with the decision on the grounds that funds from aboard should not be diverted to military research, which the KWS

17760-645: The director in 1928. Meitner became the director of the Physical Radioactivity Division, while Hahn headed the Chemical Radioactivity Division. In the early 1920s, Hahn created a new line of research. Using the "emanation method", which he had recently developed, and the "emanation ability", he founded what became known as "applied radiochemistry" for the researching of general chemical and physical-chemical questions. In 1936 Cornell University Press published

17945-528: The entire volume repeatedly and I recall that my chief disappointment with it was its length. It was too short. Glenn Seaborg, In 1924, Hahn was elected to full membership of the Prussian Academy of Sciences in Berlin, by a vote of thirty white balls to two black. While still remaining the head of his own department, he became Deputy Director of the KWIC in 1924, and succeeded Alfred Stock as

18130-676: The entry into the Bundestag of the Greens , who received 5.6% of the vote. In January 1987 the Kohl–Genscher government was returned to office, but the FDP and the Greens gained at the expense of the larger parties. Kohl's CDU and its Bavarian sister party, the CSU, slipped from 48.8% of the vote in 1983 to 44.3%. The SPD fell to 37%; long-time SPD Chairman Brandt subsequently resigned in April 1987 and

18315-420: The exact roles of these chemistry-related workers as standard for that given level of education. Because of these factors affecting exact job titles with distinct responsibilities, some chemists might begin doing technician tasks while other chemists might begin doing more complicated tasks than those of a technician, such as tasks that also involve formal applied research, management, or supervision included within

18500-510: The father of nuclear chemistry, which emerged from applied radiochemistry. Fritz Strassmann had come to the KWIC to study under Hahn to improve his employment prospects. After the Nazi Party (NSDAP) came to power in Germany in 1933, Strassmann declined a lucrative offer of employment because it required political training and Nazi Party membership. Later, rather than become a member of a Nazi-controlled organisation, Strassmann resigned from

18685-514: The federal government informed the Bundestag that the West German public broadcasters ARD and ZDF had agreed to refuse to use the initialism. The ISO 3166-1 alpha-2 country code of West Germany was DE (for Deutschland , Germany), which has remained the country code of Germany after reunification. ISO 3166-1 alpha-2 codes are the most widely used country codes, and the DE code is notably used as

18870-401: The federal republic on 3 October 1990, raising the total number of states from ten to sixteen, and ending the division of Germany. The reunited Germany is the direct continuation of the state previously informally called West Germany and not a new state, as the process was essentially a voluntary act of accession: the Federal Republic of Germany was enlarged to include the additional six states of

19055-851: The field of chemistry, such as the Royal Society of Chemistry in the United Kingdom, the American Chemical Society (ACS) in the United States, or the Institution of Chemists in India. The "Global Chemists' Code of Ethics" suggests several ethical principles that all chemists should follow: This code of ethics was codified in a 2016 conference held in Kuala Lumpur, Malaysia , run by the American Chemical Society. The points listed are inspired by

19240-450: The first report on his discovery. Hahn determined that uranium Z had a half-life of around 6.7 hours (with a two per cent margin of error) and that when uranium X1 decayed, it became uranium X2 about 99.75 per cent of the time, and uranium Z around 0.25 per cent of the time. He found that the proportion of uranium X to uranium Z extracted from several kilograms of uranyl nitrate remained constant over time, strongly indicating that uranium X

19425-550: The founding president of its successor, the Max Planck Society from 1948 to 1960. In 1959 in Berlin he co-founded the Federation of German Scientists , a non-governmental organisation committed to the ideal of responsible science. As he worked to rebuild German science, he became one of the most influential and respected citizens of post-war West Germany . Otto Hahn was born in Frankfurt am Main on 8 March 1879,

19610-508: The gas again blew back on German lines, and Hertz was poisoned. This assignment was interrupted by a mission at the front in Flanders and again in 1916 by a mission to Verdun to introduce shells filled with phosgene to the Western Front . Then once again he was hunting along both fronts for sites for gas attacks. In December 1916 he joined the new gas command unit at Imperial Headquarters. Between operations, Hahn returned to Berlin, where he

19795-468: The government and the CDU. The CDU/CSU fell just short of an absolute majority, because of the entry into the Bundestag of the Greens, who received 5.6% of the vote. In January 1987 the Kohl–Genscher government was returned to office, but the FDP and the Greens gained at the expense of the larger parties. The Social Democrats concluded that not only were the Greens unlikely to form a coalition, but also that such

19980-457: The government, demanding the resignation of Franz Josef Strauss , Defence Minister, who had decidedly overstepped his competence during the crisis. Adenauer was still wounded by his brief run for president, and this episode damaged his reputation even further. He announced that he would step down in the fall of 1963. His successor was to be Ludwig Erhard. In the early 1960s, the rate of economic growth slowed down significantly. In 1962 growth rate

20165-497: The introduction of new emergency acts : the grand coalition gave the ruling parties the two-thirds majority of votes required for their ratification. These controversial acts allowed basic constitutional rights such as freedom of movement to be limited in case of a state of emergency. During the time leading up to the passing of the laws, there was fierce opposition to them, above all by the Free Democratic Party ,

20350-743: The isolation of the new isotope. The work was interrupted by the First World War . Meitner became an X-ray nurse, working in Austrian Army hospitals, but she returned to the Kaiser Wilhelm Institute in October 1916. Hahn joined the new gas command unit at Imperial Headquarters in Berlin in December 1916 after travelling between the western and eastern front, Berlin and Leverkusen between mid-1914 and late 1916. Most of

20535-419: The kind of industry, the routine level of the task, the current needs of a particular enterprise, the size of the enterprise or hiring firm, the philosophy and management principles of the hiring firm, the visibility of the competency and individual achievements of the one seeking employment, economic factors such as recession or economic depression , among other factors, so this makes it difficult to categorize

20720-583: The larger cities, especially in West Berlin, where homosexuality had been widely accepted during the twenties in the Weimar Republic. Anger over the treatment of demonstrators following the death of Benno Ohnesorg and the attack on Rudi Dutschke, coupled with growing frustration over the lack of success in achieving their aims led to growing militance among students and their supporters. In May 1968, three young people set fire to two department stores in Frankfurt; they were brought to trial and made very clear to

20905-564: The leading expert on the field, Ernest Rutherford . Rutherford agreed to take Hahn on as an assistant, and Hahn's parents undertook to pay Hahn's expenses. From September 1905 until mid-1906, Hahn worked with Rutherford's group in the basement of the Macdonald Physics Building at McGill University in Montreal. There was some scepticism about the existence of radiothorium, which Bertram Boltwood memorably described as

21090-595: The left wing, for his support of American policies, including the Vietnam War , and right-wing authoritarian regimes. The Brandt Report became a recognised measure for describing the general North-South divide in world economics and politics between an affluent North and a poor South. Brandt was also known for his fierce anti-communist policies at the domestic level, culminating in the Radikalenerlass (Anti-Radical Decree) in 1972. In 1970, while visiting

21275-428: The letter of the convention by releasing gas from cylinders instead of shells. Haber's new unit was called Pioneer Regiment 35. After brief training in Berlin, Hahn, together with physicists James Franck and Gustav Hertz, was sent to Flanders again to scout for a site for a first gas attack . He did not witness the attack because he and Franck were off selecting a position for the next attack. Transferred to Poland, at

21460-425: The management and operation of the equipment and instrumentation necessary to perform chemical analyzes than a chemical technician. They are part of the team of a chemical laboratory in which the quality of the raw material, intermediate products and finished products is analyzed. They also perform functions in the areas of environmental quality control and the operational phase of a chemical plant. In addition to all

21645-907: The mesothorium process, of which he gave 10 per cent to Meitner. The new institute was inaugurated on 23 October 1912 in a ceremony presided over by Kaiser Wilhelm II . The Kaiser was shown glowing radioactive substances in a dark room. The move to new accommodation was fortuitous, as the wood shop had become heavily contaminated by radioactive liquids that had been spilt, and radioactive gases that had vented and then decayed and settled as radioactive dust, making sensitive measurements impossible. To ensure that their clean new laboratories stayed that way, Hahn and Meitner instituted strict procedures. Chemical and physical measurements were conducted in different rooms, people handling radioactive substances had to follow protocols that included not shaking hands, and rolls of toilet paper were hung next to every telephone and door handle. Strongly radioactive substances were stored in

21830-416: The mineral. In 1937, Strassmann and Ernst Walling extracted 253.4 milligrams of strontium carbonate from 1,012 grams of the mineral, all of which was the strontium-87 isotope, indicating that it had all been produced from radioactive decay of rubidium-87. The age of the mineral had been estimated at 1,975 million years from uranium minerals in the same deposit, which implied that the half-life of rubidium-87

22015-698: The moment when a radioactinium (thorium-227) atom emits an alpha particle, it does so with great force, and the actinium X experiences a recoil. This is enough to free it from chemical bonds, and it has a positive charge, and can be collected at a negative electrode. Hahn was thinking only of actinium, but on reading his paper, Meitner told him that he had found a new way of detecting radioactive substances. They set up some tests, and soon found actinium C ' ' (thallium-207) and thorium C ' ' (thallium-208). The physicist Walther Gerlach described radioactive recoil as "a profoundly significant discovery in physics with far-reaching consequences". In 1910, Hahn

22200-521: The most memorable sessions of parliament, the Bundestag concluded on 20 June 1991, with quite a slim majority, that both government and parliament should move to Berlin from Bonn . Political life in West Germany was remarkably stable and orderly. The Adenauer era (1949–63) was followed by a brief period under Ludwig Erhard (1963–66) who, in turn, was replaced by Kurt Georg Kiesinger (1966–69). All governments between 1949 and 1966 were formed by

22385-534: The most original of recent contributions to scientific literature. Hahn published his results in the Proceedings of the Royal Society on 24 May 1905. It was the first of more than 250 scientific publications in the field of radiochemistry. At the end of his time in London, Ramsay asked Hahn about his plans for the future, and Hahn told him about the job offer from Kalle & Co. Ramsay told him radiochemistry had

22570-483: The name. The connection to uranium remained a mystery, as neither of the known isotopes of uranium decayed into protactinium. It remained unsolved until the mother isotope, uranium-235 , was discovered in 1929. For their discovery Hahn and Meitner were repeatedly nominated for the Nobel Prize in Chemistry in the 1920s by several scientists, among them Max Planck, Heinrich Goldschmidt , and Fajans himself. In 1949,

22755-555: The nation of the future, Hitler is a hero, a Führer, a saint... In his daily life he is almost a saint. No alcohol, not even tobacco, no meat, no women. In a word: Hitler is an unequivocal Christ. The April 1933 Law for the Restoration of the Professional Civil Service banned Jews and communists from academia. Meitner was exempt from its impact because she was an Austrian rather than a German citizen. Haber

22940-428: The neutron emissions ceased. Not only had they discovered a new form of radioactive decay, they had transmuted an element into a hitherto unknown radioactive isotope of another, thereby inducing radioactivity where there had been none before. Radiochemistry was now no longer confined to certain heavy elements, but extended to the entire periodic table. Chadwick noted that being electrically neutral, neutrons could penetrate

23125-484: The nucleus.") With the Anschluss , Germany's annexation of Austria on 12 March 1938, Meitner lost her Austrian citizenship, and fled to Sweden. She carried only a little money, but before she left, Hahn gave her a diamond ring he had inherited from his mother. Meitner continued to correspond with Hahn by mail. In late 1938 Hahn and Strassmann found evidence of isotopes of an alkaline earth metal in their sample. Finding

23310-630: The occupation zones began to merge. First, the British and American zones were combined into the quasi-state of Bizonia . Soon afterwards, the French zone was included into Trizonia . Conversely, the Soviet zone became East Germany . At the same time, new federal states ( Länder ) were formed in the Allied zones; replacing the geography of pre-Nazi German states such as the Free State of Prussia and

23495-412: The old wood shop, and later in a purpose-built radium house on the institute grounds. In July 1914—shortly before the outbreak of World War I —Hahn was recalled to active duty with the army in a Landwehr regiment. They marched through Belgium, where the platoon he commanded was armed with captured machine guns. He was awarded the Iron Cross (2nd Class) for his part in the First Battle of Ypres . He

23680-548: The perceived Soviet threat. Germany's partners in the European Coal and Steel Community proposed to establish a European Defence Community (EDC), with an integrated army, navy and air force, composed of the armed forces of its member states. The West German military would be subject to complete EDC control, but the other EDC member states ( Belgium , France, Italy, Luxembourg and the Netherlands ) would cooperate in

23865-580: The phenomena of atomic recoil and nuclear isomerism , and pioneered rubidium–strontium dating . In 1938, Hahn, Meitner and Fritz Strassmann discovered nuclear fission , for which Hahn alone was awarded the 1944 Nobel Prize in Chemistry . A graduate of the University of Marburg , which awarded him a doctorate in 1901, Hahn studied under Sir William Ramsay at University College London and at McGill University in Montreal under Ernest Rutherford , where he discovered several new radioactive isotopes. He returned to Germany in 1906; Emil Fischer let him use

24050-428: The phenomenon of burning . Fire was a mystical force that transformed one substance into another and thus was of primary interest to mankind. It was fire that led to the discovery of iron and glasses . After gold was discovered and became a precious metal, many people were interested to find a method that could convert other substances into gold. This led to the protoscience called alchemy . The word chemist

24235-482: The police and quantities of documents were seized. Chancellor Adenauer proclaimed in the Bundestag that the article was tantamount to high treason and that the authors would be prosecuted. The editor/owner of the magazine, Rudolf Augstein spent some time in jail before the public outcry over the breaking of laws on freedom of the press became too loud to be ignored. The FDP members of Adenauer's cabinet resigned from

24420-450: The preferred choice for the highest administrative positions on big enterprises involved in chemistry-related duties. Some positions, especially research oriented, will only allow those chemists who are Ph.D. holders. Jobs that involve intensive research and actively seek to lead the discovery of completely new chemical compounds under specifically assigned monetary funds and resources or jobs that seek to develop new scientific theories require

24605-512: The presence of multiple isotopes of at least four such elements, and (mistakenly) identified them as elements with atomic numbers 93 through 96. They were the first scientists to measure the 23-minute half-life of uranium-239 and to establish chemically that it was an isotope of uranium, but were unable to continue this work to its logical conclusion and identify the real element 93. They identified ten different half-lives, with varying degrees of certainty. To account for them, Meitner had to hypothesise

24790-588: The prime cause of the violence against students. Trucks carrying newspapers were set on fire and windows in office buildings broken. In the wakes of these demonstrations, in which the question of America's role in Vietnam began to play a bigger role, came a desire among the students to find out more about the role of the parent-generation in the Nazi era. The proceedings of the War Crimes Tribunal at Nuremberg had been widely publicised in Germany but until

24975-465: The proceedings revealed to the German public the nature of the concentration camp system and it became evident that the Shoah was of vastly greater dimensions than the German population had believed. (The term "Holocaust" for the systematic mass-murder of Jews first came into use in 1979, when a 1978 American mini-series with that name was shown on West German television.) The processes set in motion by

25160-439: The process, he found that a precipitation of thorium A ( polonium -216) and thorium B (lead-212) also contained a short-lived "element", which he named thorium C (which was later identified as polonium-212). Hahn was unable to separate it, and concluded that it had a very short half-life (it is about 300 ns). He also identified radioactinium (thorium-227) and radium D (later identified as lead-210). Rutherford remarked that: "Hahn has

25345-399: The reactions were from different isotopes of uranium; three were known: uranium-238, uranium-235 and uranium-234. However, when she calculated the neutron cross section , it was too large to be anything other than the most abundant isotope, uranium-238. She concluded that it must be another case of the nuclear isomerism that Hahn had discovered in protactinium. She therefore ended her report on

25530-585: The reformation of the GDR's Länder , the East German states and East Berlin joined the Federal Republic . With territories and frontiers that coincided largely with the ones of old Middle Ages East Francia and the 19th-century Napoleonic Confederation of the Rhine , the Federal Republic of Germany was founded on 23 May 1949 under the terms of the Bonn–Paris conventions , whereby it obtained "the full authority of

25715-404: The release of prisoners sympathetic to their ideas. In the 1990s attacks were still being committed under the name "RAF". The last action took place in 1993 and the group announced it was giving up its activities in 1998. Evidence that the groups had been infiltrated by German Intelligence undercover agents has since emerged, partly through the insistence of the son of one of their prominent victims,

25900-406: The remaining rubidium, he could measure the age of the mineral, assuming that his original calculation of the half-life was reasonably accurate. This would be a superior dating method to studying the decay of uranium, because some of the uranium turns into helium, which then escapes, resulting in rocks appearing to be younger than they really were. Jacob Papish helped Hahn obtain several kilograms of

26085-414: The responsibilities of that same job title. The level of supervision given to that chemist also varies in a similar manner, with factors similar to those that affect the tasks demanded for a particular chemist It is important that those interested in a Chemistry degree understand the variety of roles available to them (on average), which vary depending on education and job experience. Those Chemists who hold

26270-624: The rising West German student movement , a group calling itself Notstand der Demokratie ("Democracy in Crisis") and members of the Campaign against Nuclear Armament. A key event in the development of open democratic debate occurred in 1967, when the Shah of Iran , Mohammad Reza Pahlavi , visited West Berlin. Several thousand demonstrators gathered outside the Opera House where he was to attend

26455-438: The ruling parties the two-thirds majority of votes required to see them in. These controversial acts allowed basic constitutional rights such as freedom of movement to be limited in case of a state of emergency . Leading up to the passing of the laws, there was fierce opposition to them, above all by the FDP, the rising German student movement , a group calling itself Notstand der Demokratie  [ de ] ("Democracy in

26640-460: The same education and skills with chemists. The work of chemists is often related to the work of chemical engineers , who are primarily concerned with the proper design, construction and evaluation of the most cost-effective large-scale chemical plants and work closely with industrial chemists on the development of new processes and methods for the commercial-scale manufacture of chemicals and related products. The roots of chemistry can be traced to

26825-516: The scientific paper Physikalischen Zeitschrift under the title Die Muttersubstanz des Actiniums; Ein Neues Radioaktives Element von Langer Lebensdauer ("The Mother Substance of Actinium; A New Radioactive Element with a Long Lifetime"). Although Fajans and Göhring had been the first to discover the element, custom required that an element was represented by its longest-lived and most abundant isotope, and while brevium had

27010-457: The scientific papers will be agog with a new discovery which has been added to the many brilliant triumphs of Gower Street. Dr. Otto Hahn, who is working at University College, has discovered a new radioactive element, extracted from a mineral from Ceylon, named Thorianite, and possibly, it is conjectured, the substance which renders thorium radioactive. Its activity is at least 250,000 times as great as that of thorium, weight for weight. It gives off

27195-446: The sleeves of his suit. It was not possible to conduct research in the wood shop, but Alfred Stock , the head of the inorganic chemistry department, let Hahn use a space in one of his two private laboratories. Hahn purchased two milligrams of radium from Friedrich Oskar Giesel , the discoverer of emanium (radon), for 100 marks a milligram (equivalent to €700 in 2021), and obtained thorium for free from Otto Knöfler, whose Berlin firm

27380-493: The students at the universities in Berlin. One of the most prominent campaigners was a young man from East Germany called Rudi Dutschke who also criticised the forms of capitalism that were to be seen in West Berlin. Just before Easter 1968, a young man tried to kill Dutschke as he bicycled to the student union, seriously injuring him. All over West Germany, thousands demonstrated against the Springer newspapers which were seen as

27565-454: The students, laboratory assistants and technicians had been called up, so Hahn, who was stationed in Berlin between January and September 1917, and Meitner had to do everything themselves. By December 1917 she was able to isolate the substance, and after further work were able to prove that it was indeed the missing isotope. Meitner submitted her and Hahn's findings for publication in March 1918 to

27750-468: The subsequent Potsdam Agreement , the four Allied Powers asserted joint sovereignty over "Germany as a whole", defined as the totality of the territory within the occupation zones. Former German areas east of the rivers Oder and Neisse and outside of 'Germany as a whole' were officially separated from German sovereignty in August 1945 and transferred from Soviet military occupation to Polish and Soviet (in

27935-701: The technique, leading to the decisive experiment on 16–17 December 1938, produced puzzling results: the three isotopes consistently behaved not as radium, but as barium. Hahn, who did not inform the physicists in his Institute, described the results exclusively in a letter to Meitner on 19 December: Chemist Chemists use their knowledge to learn the composition and properties of unfamiliar substances, as well as to reproduce and synthesize large quantities of useful naturally occurring substances and create new artificial substances and useful processes. Chemists may specialize in any number of subdisciplines of chemistry . Materials scientists and metallurgists share much of

28120-493: The term, was coined in 1913 by the British chemist Frederick Soddy . Ramsay was enthusiastic when yet another new element was found in his institute, and he intended to announce the discovery in a correspondingly suitable way. In accordance with tradition this was done before the committee of the venerable Royal Society . At the session of the Royal Society on 16 March 1905 Ramsay communicated Hahn's discovery of radiothorium. The Daily Telegraph informed its readers: Very soon

28305-623: The territories east of the Oder-Neisse line must be transferred to Poland and the Soviet Union in any peace agreement. The conference agreed that post-war Germany, minus these transfers, would be divided into four occupation zones : a French Zone in the far west; a British Zone in the northwest; an American Zone in the south; and a Soviet Zone in the East. Berlin was separately divided into four zones. These divisions were not intended to dismember Germany, only to designate zones of administration. By

28490-412: The training usually given to chemical technologists in their respective degree (or one given via an associate degree), a chemist is also trained to understand more details related to chemical phenomena so that the chemist can be capable of more planning on the steps to achieve a distinct goal via a chemistry-related endeavor. The higher the competency level achieved in the field of chemistry (as assessed via

28675-428: The united caucus of the Christian-Democratic Union (CDU) and Christian Social Union (CSU), either alone or in coalition with the smaller Free Democratic Party (FDP) or other right-wing parties. Kiesinger's 1966–69 "Grand Coalition" was between West Germany's two largest parties, the CDU/CSU and the Social Democratic Party (SPD). This was important for the introduction of new emergency acts—the Grand Coalition gave

28860-443: The war he became the head of the KWIC, while remaining in charge of his own department. Between 1934 and 1938, he worked with Strassmann and Meitner on the study of isotopes created by neutron bombardment of uranium and thorium, which led to the discovery of nuclear fission. He was an opponent of national socialism and the persecution of Jews by the Nazi Party that caused the removal of many of his colleagues, including Meitner, who

29045-428: The way, Hahn determined that just as he was unable to separate thorium from radiothorium, so he could not separate mesothorium I from radium. In Canada there had been no requirement to be circumspect when addressing the egalitarian New Zealander Rutherford, but many people in Germany found his manner off-putting, and characterised him as an "Anglicised Berliner". Hahn completed his habilitation in early 1907, and became

29230-432: The world's second-largest economy. The first chancellor Konrad Adenauer , who remained in office until 1963, worked for a full alignment with the NATO rather than neutrality, and secured membership in the military alliance. Adenauer was also a proponent of agreements that developed into the present-day European Union . When the G6 was established in 1975, there was no serious debate as to whether West Germany would become

29415-409: The youngest son of Heinrich Hahn (1845–1922), a prosperous glazier (and founder of the Glasbau Hahn company), and Charlotte Hahn née Giese (1845–1905). He had an older half-brother Karl, his mother's son from her previous marriage, and two older brothers, Heiner and Julius. The family lived above his father's workshop. The younger three boys were educated at the Klinger Oberrealschule in Frankfurt. At

29600-471: Was 2.3 x 10 years: quite close to Hahn's original calculation. Rubidium–strontium dating became a widely used technique for dating rocks in the 1950s, when mass spectrometry became common. After James Chadwick discovered the neutron in 1932, Irène Curie and Frédéric Joliot irradiated aluminium foil with alpha particles. They found that this results in a short-lived radioactive isotope of phosphorus . They noted that positron emission continued after

29785-409: Was 4.7% and the following year, 2.0%. After a brief recovery, the growth rate slowed again into a recession, with no growth in 1967. A new coalition was formed to deal with this problem. Erhard stepped down in 1966 and was succeeded by Kurt Georg Kiesinger . He led a grand coalition between West Germany's two largest parties, the CDU/CSU and the Social Democratic Party (SPD). This was important for

29970-470: Was a joyful participant in the Christmas truce of 1914, and was commissioned as a lieutenant. In mid-January 1915, he was summoned to meet chemist Fritz Haber , who explained his plan to break the trench deadlock with chlorine gas . Hahn raised the issue that the Hague Convention banned the use of projectiles containing poison gases, but Haber explained that the French had already initiated chemical warfare with tear gas grenades, and he planned to get around

30155-502: Was a major producer of thorium products. In the space of a few months Hahn discovered mesothorium I (radium-228), mesothorium II (actinium-228), and – independently from Boltwood – the mother substance of radium, ionium (later identified as thorium-230 ). In subsequent years, mesothorium I assumed great importance because, like radium-226 (discovered by Pierre and Marie Curie ), it was ideally suited for use in medical radiation treatment, but cost only half as much to manufacture. Along

30340-401: Was able to slip back to his old laboratory and work with Meitner, continuing with their research. In September 1917 he was one of three officers, disguised in Austrian uniforms, sent to the Isonzo front in Italy to find a suitable location for an attack, using newly developed rifled minenwerfers that simultaneously hurled hundreds of containers of poison gas onto enemy targets. They selected

30525-424: Was allowed to work in the wood shop, which had its own external entrance, but could not enter the rest of the institute, including Hahn's laboratory space upstairs. If she wanted to go to the toilet, she had to use one at the restaurant down the street. The following year, women were admitted to universities, and Fischer lifted the restrictions and had women's toilets installed in the building. Harriet Brooks observed

30710-414: Was an isotope of the missing element, which they named "brevium" after its short half life. However, it was a beta emitter, and therefore could not be the mother isotope of actinium. This had to be another isotope of the same element. Hahn and Meitner set out to find the missing mother isotope. They developed a new technique for separating the tantalum group from pitchblende , which they hoped would speed

30895-399: Was an unacceptable threat to the balance of nuclear power, because it increased the likelihood of political coercion and required a western response. NATO responded in the form of its twin-track policy. The domestic reverberations were serious inside the SPD, and undermined its coalition with the FDP. One of his major successes, in collaboration with French President Valéry Giscard d'Estaing ,

31080-519: Was appointed professor by the Prussian Minister of Culture and Education, August von Trott zu Solz . Two years later, Hahn became head of the Radioactivity Department of the newly founded Kaiser Wilhelm Institute for Chemistry (KWIC) in Berlin-Dahlem (in what is today the Hahn-Meitner-Building of the Free University of Berlin ). This came with an annual salary of 5,000 marks (equivalent to €29,000 in 2021). In addition, he received 66,000 marks in 1914 (equivalent to €369,000 in 2021) from Knöfler for

31265-407: Was exhausted, for reasons which had nothing to do with the process going on at the time". Finance Minister Helmut Schmidt (SPD) then formed a government, continuing the SPD–FDP coalition. He served as Chancellor from 1974 to 1982. Hans-Dietrich Genscher, a leading FDP official, was Vice Chancellor and Foreign Minister in the same years. Schmidt, a strong supporter of the European Community (EC) and

31450-424: Was forced to flee Germany in 1938. During World War II , he worked on the German nuclear weapons program , cataloguing the fission products of uranium. At the end of the war he was arrested by the Allied forces and detained in Farm Hall with nine other German scientists, from July 1945 to January 1946. Hahn served as the last president of the Kaiser Wilhelm Society for the Advancement of Science in 1946 and as

31635-415: Was held at the Reichstag building , including Chancellor Helmut Kohl , President Richard von Weizsäcker , former Chancellor Willy Brandt and many others. One day later, the parliament of the united Germany would assemble in an act of symbolism in the Reichstag building. However, at that time, the role of Berlin had not yet been decided upon. Only after a fierce debate, considered by many as one of

31820-504: Was his wish that it be distributed to the dismissed staff to facilitate their emigration. Hahn brokered a deal whereby 10 per cent of the funds would be allocated to Haber's people and the rest to KWS, but the Rockefeller Foundation insisted that the funds be used for their original scientific research or else be returned. In August 1933 the administrators of the KWS were alerted that several boxes of Rockefeller Foundation-funded equipment were about to be shipped to Herbert Freundlich , one of

32005-432: Was hugely unpopular in West Germany and was opposed by the new government of Konrad Adenauer. In 1951, several laws were passed granting amnesties and ending denazification. As a result, many people with a former Nazi past ended up again in the political apparatus of West Germany. Between 1951 and 1953, there was even an effort by a clandestine group of former Nazi functionaries, known as the Naumann Circle , to infiltrate

32190-404: Was increasingly undertaking. When Planck returned from vacation, he ordered Hahn to expedite the shipment. Haber died on 29 January 1934. A memorial service was held on the first anniversary of his death. University professors were forbidden to attend, so they sent their wives in their place. Hahn, Planck and Joseph Koeth attended, and gave speeches. The aging Planck did not seek re-election, and

32375-422: Was known for having discovered the noble gases . Here Hahn worked on radiochemistry , at that time a very new field. In early 1905, in the course of his work with salts of radium , Hahn discovered a new substance he called radiothorium (thorium-228), which at that time was believed to be a new radioactive element. In fact, it was an isotope of the known element thorium ; the concept of an isotope, along with

32560-413: Was likewise exempt as a veteran of World War I, but chose to resign his directorship of the Kaiser Wilhelm Institute of Physical Chemistry and Electrochemistry in protest on 30 April 1933. The directors of the other Kaiser Wilhelm Institutes, even the Jewish ones, complied with the new law, which applied to the KWS as a whole and those Kaiser Wilhelm institutes with more than 50% state support, which exempted

32745-485: Was still to work in industry. He received an offer of employment from Eugen Fischer, the director of Kalle & Co.  [ de ] (and the father of organic chemist Hans Fischer ), but a condition of employment was that Hahn had to have lived in another country and have a reasonable command of another language. With this in mind, and to improve his knowledge of English, Hahn took up a post at University College London in 1904, working under Sir William Ramsay , who

32930-455: Was succeeded by Hans-Jochen Vogel . The FDP's share rose from 7% to 9.1%, its best showing since 1980. The Greens' share rose to 8.3% from their 1983 share of 5.6%. With the collapse of eastern bloc in 1989, symbolised by the opening of the Berlin Wall , there was a rapid move towards German reunification ; and a final settlement of the post-war special status of Germany . Following democratic elections, East Germany declared its accession to

33115-424: Was succeeded in 1937 as president by Carl Bosch , a winner of the Nobel Prize in Chemistry and the chairman of the board of IG Farben , a company which had bankrolled the Nazi Party since 1932. Telschow became Secretary of the KWS. He was an enthusiastic supporter of the Nazis, but was also loyal to Hahn, being one of his former students, and Hahn welcomed his appointment. Hahn's chief assistant, Otto Erbacher, became

33300-409: Was the first example of nuclear isomerism . Walther Gerlach later remarked that this was "a discovery that was not understood at the time but later became highly significant for nuclear physics". Not until 1936 was Carl Friedrich von Weizsäcker able to provide a theoretical explanation of the phenomenon. For this discovery, whose full significance was recognised by very few, Hahn was again proposed for

33485-430: Was the launching of the European Monetary System (EMS) in April 1978. In October 1982 the SPD–FDP coalition fell apart when the FDP joined forces with the CDU/CSU to elect CDU Chairman Helmut Kohl as Chancellor in a constructive vote of no confidence . Following national elections in March 1983, Kohl emerged in firm control of both the government and the CDU. The CDU/CSU fell just short of an absolute majority, due to

33670-539: Was the mother of uranium Z. To prove this, Hahn obtained a hundred kilograms of uranyl nitrate; separating the uranium X from it took weeks. He found that the half-life of the parent of uranium Z differed from the known 24-day half-life of uranium X1 by no more than two or three days, but was unable to get a more accurate value. Hahn concluded that uranium Z and uranium X2 were both the same isotope of protactinium ( protactinium-234 ), and they both decayed into uranium II ( uranium-234 ), but with different half-lives. Uranium Z

33855-416: Was the steady growth of a feminist movement in which women demonstrated for equal rights. Until 1977, a married woman had to have the permission of her husband if she wanted to take on a job or open a bank account. Further reforms in 1979 to parental rights law gave equal legal rights to the mother and the father, abolishing the legal authority of the father. Parallel to this, a gay movement began to grow in

34040-422: Was under the control of the Allied Control Council (ACC), West Berlin politically aligned itself with West Germany and was directly or indirectly represented in its federal institutions. The foundation for the influential position held by Germany today was laid during the economic miracle of the 1950s ( Wirtschaftswunder ), when West Germany rose from the enormous destruction wrought by World War II to become

34225-422: Was used in many languages. Westdeutschland was also a widespread colloquial form used in German-speaking countries, usually without political overtones. On 4–11 February 1945 leaders from the United States, the United Kingdom, and the Soviet Union held the Yalta Conference where future arrangements regarding post-war Europe and Allied strategy against Japan in the Pacific were negotiated. They agreed that

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