Collision-Induced Light Scattering in Liquids

Abstract

The isolated binary collision model of light scattering in liquids has been developed to obtain an analytical expression for the spectral intensity in the wings of the Rayleigh spectrum. The expression shows the dependence of the spectral intensity on the nature of the interaction potential energies between the collision pair, on the frequency shift, and on the temperature. The exponential part of the intensity appears in the form exp( − constω12/19T−7/19 + constω6/19T−13/19 − constT−1),where ω is the frequency shift and T is the temperature. The pre-exponential part is shown to be weakly dependent on ω and T. Numerical studies for Xe, Ar, and CCl4 show that the calculation agrees quantitatively with experiment. Both the ω and T dependence of the spectra have been investigated.