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Weaker spectral features in the Raman spectra of MN 3 (M = K, Rb, Cs)
Author(s) -
Ti S. S.,
Kettle S. F. A.,
Ra Ø.
Publication year - 1977
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.1250060104
Subject(s) - raman spectroscopy , phonon , spectral line , chemistry , intensity (physics) , atomic physics , molecular physics , physics , nuclear magnetic resonance , analytical chemistry (journal) , condensed matter physics , optics , quantum mechanics , chromatography
The weaker spectral features in the Raman spectra of MN 3 (M = K, Rb, Cs) in the region 1240–1360 cm −1 are reported. The present study indicates that the two‐phonon modes involving ν 2 can be analysed solely in terms of k = 0 selection rules whilst the two‐ and three‐phonon bands involving internal and external combination modes require a critical point analysis. There are several possible assignments of a multiphonon band of the latter type; its appearance apparently depends on proximity to an intense fundamental mode, from which it presumably steals intensity.