Density dependence of interaction-induced scattering contributions to the depolarized Rayleigh band of ethane

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Abstract
Depolarized Rayleigh and Raman ν3(C—C stretch) spectra of ethane at 50 °C in the density range from 0.16ρc to 2.3ρc are reported (where ρc is the critical density). With the two pieces of information an attempt is made to separate orientational from non-orientational interaction-induced scattering contributions experimentally. The non-orientation spectra resemble in several respects the spectra obtained from atomic fluids such as argon. In particular, the low-frequency induced spectral intensity shows typical two-body–three-body cancellation effects with increasing density.