Molecular Vibrations, Normal Co-Ordinates, Selection Rules-Infra Red And Raman Spectra

2021 ◽  
pp. 185-212
Author(s):  
S.C. Rakshit
Keyword(s):  
Raman Spectra ◽  
Molecular Vibrations ◽  
Selection Rules ◽  
Infra Red

Molecular vibrations of sulphur chloride pentafluoride. Part 1.—Infra-red and Raman spectra

1960 ◽  
Vol 56 (0) ◽  
pp. 945-951 ◽  
Author(s):  
L. H. Cross ◽  
H. L. Roberts ◽  
P. Goggin ◽  
L. A. Woodward
Keyword(s):  
Raman Spectra ◽  
Molecular Vibrations ◽  
Infra Red

Studies of the Jahn - Teller effect IV. The vibrational spectra of spin-degenerate molecules

1962 ◽  
Vol 255 (1050) ◽  
pp. 31-53 ◽  
Keyword(s):  
Raman Spectrum ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Physical Theory ◽  
Vibronic Coupling ◽  
Infra Red ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Active Vibration ◽  
Degenerate States

The physical theory necessary for interpreting the vibrational spectra of spin-degenerate molecules is developed in this paper. Particular attention is paid to those molecules whose behaviour is expected to be markedly different from that of both orbitally non-degenerate molecules and those with purely spatial degeneracy. These include certain Kramers degenerate molecules, whose Raman spectra are expected to contain reverse-polarized contributions, and also tetrahedral and octahedral molecules in fourfold degenerate states. The case of a fourfold degenerate octahedral molecule is investigated in the limits of strong vibronic coupling by one of the Jahn—Teller active vibrations (e g and t 2g ). It turns out that the forbidden t 2u vibration may be infra-red active, that the Raman spectrum may contain reverse-polarized contributions and that both infra-red and Raman spectra may contain strong progressions of bands involving multiple excitations of the vibronically active vibration.

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