Coupling of vibrational and reorientational dephasing in mobile liquids

Abstract

The vibrational dephasing time of a normal mode of a molecule is shown to depend on the method of observation (infra-red, isotropic Raman or anisotropic Raman) if molecular reorientation is faster than or on a comparable time scale to molecular translation. In the rapid motion limit considered in this paper it is found that reorientational and vibrational dephasing are sometimes coupled to give anomalously broad or narrow lines or even possibly a central dip.