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Second order Raman spectrum of carbon disulphide in the condensed phase
Author(s) -
Umapathy S.,
Kesavasamy K.,
Krishnamurthy N.
Publication year - 1980
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.1250090303
Subject(s) - raman spectroscopy , phonon , brillouin zone , molecule , chemistry , lattice (music) , vibrational spectrum , spectral line , molecular physics , crystallography , condensed matter physics , physics , quantum mechanics , organic chemistry , acoustics
Abstract Below 162K, carbon disulphide crystallizes in the space group D 2h 18 with two molecules in the primitive cell. The internal modes v 1 , v 2 and v 3 of the isolated CS 2 molecule are split due to static and correlation field splittings. Anderson et al . have extensively studied the Raman and infrared spectra of CS 2 at 79 K and 18 K and have analysed the internal and external modes with a lattice dynamical calculation of the q = 0 phonons. However, their spectra reveal the presence of extensive second order features accompanying the v 1 , v 2 , v 3 and 2 v 1 bands. The present investigation attempts an interpretation of these second order Raman spectra employing Born's theory and the lattice dynamical calculation of phonons at all allowed q points in the Brillouin zone employing the rigid molecule approximation.