Nikolay Semyonov

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For the Russian handball player, see Nikolay Semyonov (handballer).Soviet physical chemist

Nikolay Nikolayevich Semyonov (or Semënov), ForMemRS (Russian: Никола́й Никола́евич Семёнов; 15 April::1896 – 25 September 1986) was a Soviet physicist and chemist. Semyonov was awarded the 1956 Nobel Prize in Chemistry for his work on the mechanism of chemical transformation.

1 Life and career
2 Significant works
3 Honours and awards
4 See also
5 References
6 External links

Life and career

Semyonov was born in Saratov, the son of Elena Dmitrieva and Nikolai Alex Semyonov. He graduated from the department of physics of Petrograd University (1913–1917), where he was a student of Abram Fyodorovich Ioffe. In 1918, he moved to Samara, where he was enlisted into Kolchak's White Army during Russian Civil War.

In 1920, he returned to Petrograd and took charge of the electron phenomena laboratory of the Petrograd Physico-Technical Ins*ute. He also became the vice-director of the ins*ute. In 1921, he married philologist Maria Boreishe-Liverovsky (student of Zhirmunsky). She died two years later. In 1923, Nikolay married Maria's niece Natalia Nikolayevna Burtseva. She brought Nikolay a son (Yuri) and a daughter (Lyudmila).

During that difficult time, Semyonov, together with Pyotr Kapitsa, discovered a way to measure the magnetic field of an atomic nucleus (1922). Later the experimental setup was improved by Otto Stern and Walther Gerlach and became known as Stern–Gerlach experiment.

In 1925, Semyonov, together with Yakov Frenkel, studied kinetics of condensation and adsorption of vapors. In 1927, he studied ionisation in gases and published an important book, Chemistry of the Electron. In 1928, he, together with Vladimir Fock, created a theory of thermal disruptive discharge of dielectrics.

He lectured at the Petrograd Polytechnical Ins*ute and was appointed Professor in 1928. In 1931, he organized the Ins*ute of Chemical Physics of the USSR Academy of Sciences (which moved to Chernogolovka in 1943) and became its first director. In 1932, he became a full member of the Soviet Academy of Sciences.

Significant works

Semyonov (right) and Kapitsa, portrait by Boris Kustodiev, 1921. Semyonov on a 2021 stamp of Russia

Semyonov's outstanding work on the mechanism of chemical transformation includes an exhaustive *ysis of the application of the chain theory to varied reactions (1934–1954) and, more significantly, to combustion processes. He proposed a theory of degenerate branching, which led to a better understanding of the phenomena *ociated with the induction periods of oxidation processes.

Semyonov wrote two important books outlining his work. Chemical Kinetics and Chain Reactions was published in 1934, with an English edition in 1935. It was the first book in the U.S.S.R. to develop a detailed theory of unbranched and branched chain reactions in chemistry. Some Problems of Chemical Kinetics and Reactivity, first published in 1954, was revised in 1958; there are also English, American, German, and Chinese editions. In 1956, he was awarded the Nobel Prize in Chemistry (together with Sir Cyril Norman Hinshelwood) for this work.

Honours and awards

Orders of Lenin, nine times (incl. 1945, 1953, 1956, 1966, 1971, 1976, 1981)
Stalin Prize (1941, 1949)
Honorary Member of the British Chemical Society (1943)
Order of the Red Banner of Labour (1946)
Honorary member of the Indian Academy of Sciences (1954)
Nobel Prize in Chemistry (1956)
Foreign Member of the Royal Society of London (1958)
Member of the German Academy of Sciences Leopoldina (1959)
Honorary member of the Hungarian Academy of Sciences (1961)
Honorary member of the New York Academy of Sciences (1962)
Foreign member of the United States National Academy of Sciences (1963)
Honorary Member of the Romanian Academy (1965)
Hero of Socialist Labour, twice (1966, 1976)
Lomonosov Gold Medal (1969)
Lenin Prize (1976)
Order of the October Revolution (1986)
Medal "In commemoration of the centenary of the birth of Vladimir Ilyich Lenin"
Mendeleev Prize

Semyonov was also an Honorary Doctor of several universities: Oxford (1960), Brussels (1962), London (1965), Budapest Technical University (1965), Polytechnic Ins*ute of Milan (1964) and others.

References

External links

Media related to Nikolay Nikolayevich Semyonov at Wikimedia Commons

Nikolay Semyonov on Nobelprize.org including the Nobel Lecture, 11 December 1956 Some Problems Relating to Chain Reactions and to the Theory of Combustion
Semyonov's Nobel Lecture Some Problems Relating to Chain Reactions and to the Theory of Combustion
N.N. *ov Ins*ute of Chemical Physics
(in Russian) Semyonov's Biography.
(in Russian) Another Semyonov's Biography.