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Analysis of two‐phonon resonances in and Raman spectroscopy of ammonium chloride
Author(s) -
Anikiev A. A.,
Umarov B. S.,
Scott J. F.
Publication year - 1985
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.1250160506
Subject(s) - phonon , raman spectroscopy , overtone , chemistry , spectral line , spectroscopy , ammonium chloride , wave vector , atomic physics , molecular physics , physics , condensed matter physics , quantum mechanics
Using a model calculation of the unperturbed two‐phonon density of states for the frequency region encompassing the 2ν 4 overtone of NH 4 Cl, together with the quantum field Green function approach of Ruvalds and Zawadowski, both the shape of the perturbed two‐phonon band in the Raman spectra and the detalled spectral evolution of the polariton spectra in this frequency regime as a function of wave vector q have been calculated. The calculation, which does not require a two‐phonon bound state, is in good agreement with experiment.