Fg. Baglin et al., IDENTIFICATION OF 1-BODY, 2-BODY AND 3-BODY RAMAN-SCATTERING BY THE FIELD GRADIENT INDUCED DIPOLE-A TENSOR IN METHANE, Molecular physics, 84(1), 1995, pp. 115-123
In previous work involving the nu1 mode, Raman depolarization ratio (R
DR) density dependent studies of supracritical methane, 10% methane in
carbon dioxide, and 10% methane in argon, the present authors had hyp
othesized that the Coriolis coupling and resulting dipole moment playe
d a leading role in the explanation of the RDR versus density (pressur
e) dependence found. This was necessitated by the fact that we could f
ind no direct evidence for interaction induced ii, i.e., 2-body and 3-
body light scattering. That evidence has now been identified from the
previously recorded pure methane data and is the subject of this paper
. It should be noted, however, that this current interpretation revers
es the previous arguments for angular dependent intermolecular couplin
g as a contributing factor in addition to translational ii in explaini
ng the earlier RDR results.