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Dynamical properties of no 2 − impurity molecules in alkali halides. I. Theory
Author(s) -
Zavt G. S.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220800147
Subject(s) - impurity , halide , raman scattering , lattice (music) , molecule , translational motion , vibration , alkali metal , chemistry , molecular physics , raman spectroscopy , harmonic oscillator , physics , quantum mechanics , classical mechanics , inorganic chemistry , acoustics
The effect of an impurity molecule on the lattice vibrations is studied. The translational and librational motion of the molecule and lattice vibrations are considered from a unified point of view. Green's functions describing all types of motions as well as their mixing are calculated in the harmonic approximation. Optical response functions (far infrared absorption coefficient and Raman scattering tensor) are found. It is shown that, unlike the case of point impurities, the spectral functions can display interference features, such as asymmetric peaks or antiresonances.