The three body correlation spectrum in collision induced light scattering by isotropic molecular gases

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Abstract
The three body correlation spectra in the collision induced light scattering by gaseous Ar, CH4, CF4 and SF6 at 295 K are reported. The zeroth and second frequency moments are compared with calculations based on a pairwise additive triplet cluster polarizability. It is found that the experimental results may be accounted for with the use of the first order dipole-induced dipole model for the polarizability. The spectra may be used to distinguish between the suitability of various intermolecular potentials; modern potentials give excellent results for Ar and CH4 and a Lennard-Jones 28-7 potential best describes the CF4 and SF6 spectra.