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Shell model description of hyper‐Raman scattering from alkali metal halides
Author(s) -
Vogt H.
Publication year - 1990
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.1250211209
Subject(s) - raman scattering , raman spectroscopy , anharmonicity , chemistry , alkali metal , ionic bonding , coulomb , halide , x ray raman scattering , tensor (intrinsic definition) , phonon , molecular physics , scattering , atomic physics , physics , condensed matter physics , inorganic chemistry , quantum mechanics , ion , geometry , mathematics , organic chemistry , electron
Hyper‐Raman scattering by the zone‐centre optical phonons of alkali metal halides is described in terms of an anharmonic shell model. In order to reproduce the measured relative values of the hyper‐Raman tensor elements, three types of fourth‐order coupling parameters, representing intra‐ionic, inter‐ionic and Coulomb anharmonicities have to be taken into account. Deducing the non‐linear force constants of the short‐range inter‐ionic interactions from a Born‐Mayer potential and supplementing them by exact expressions of their Coulomb Counterparts, it is possible to determine all parameters contributing to hyper‐Raman scattering. The model also predicts the third‐harmonic generation coefficients in satisfactory agreement with experimental data.