Alexander Sergeevich Davydov (Russian: Александр Сергеевич Давы́дов, Ukrainian: Олекса́ндр Сергі́йович Дави́дов) (26 December 1912 – 19 February 1993) was a Soviet and Ukrainian physicist. Davydov graduated from Moscow State University in 1939. In 1963-1990 he was Director of Institute for Theoretical Physics of the Ukrainian Academy of Sciences. His main contributions were in theory of absorption, scattering and dispersion of the light in molecular crystals. In 1948, he predicted the phenomenon that is known as Davydov splitting or factor-group splitting, "the splitting of bands in the electr
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