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How the vibrational frequency varies with temperature
Author(s) -
Kolesov Boris A.
Publication year - 2017
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5009
Subject(s) - anharmonicity , phonon , wavenumber , raman spectroscopy , chemistry , vibration , molecular vibration , renormalization , hydrogen bond , diamond , excitation , silicon , computational chemistry , molecular physics , condensed matter physics , molecule , physics , quantum mechanics , organic chemistry
A renormalization of mode wavenumber with temperature in inorganic (silicon, diamond) and molecular crystals (α‐S 8 ) is considered. The conventional theory of wavenumber varying is based on phonon decay into other phonons. A new approach based on the process of phonon excitation and analytical expression for ω( T ) function is proposed. A numerical quantity of anharmonic contributions from vibration of chemical bonds of different types is discussed. It is shown that anharmonicity of hydrogen bonds is essentially higher than that of the other types of chemical bond. Copyright © 2016 John Wiley & Sons, Ltd.