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Investigation of the Phonon Sidebands of SH − and SeH − Centres in Cesium Halides and Potassium Bromide
Author(s) -
Otto J.
Publication year - 1987
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.2221420112
Subject(s) - phonon , caesium , rubidium , halide , chemistry , intramolecular force , spectral line , potassium , atomic physics , condensed matter physics , physics , inorganic chemistry , stereochemistry , quantum mechanics , organic chemistry
Infra‐red spectra of SH − and SeH − centres in cesium halides show unusually strong phonon sidebands, whereas the intramolecular vibration ν 0 itself is only weak. The effective charge of SH − centres is calculated from the intensity of the ν 0 line and turns out to be five times smaller for cesium than for potassium and rubidium halides. Most of the fine structure in the phonon sidebands can be directly correlated with the phonon density of states of the unperturbed host lattices. LA and TA phonons appear alternately in the sidebands of the stretching vibration ν 0 and the combination lines ν 0 + ν L and ν 0 + 2ν L with the librational mode ν L of the centres.