Collision induced hyper-Rayleigh light scattering in CCl4

Measurements of hyper-Rayleigh scattering in carbon tetrachloride liquid and vapour indicate that interaction induced contributions account for more than half of the scattered intensity from the liquid phase. The spectral characteristics of hyper-Rayleigh scattering from carbon tetrachloride are influenced by the effects of hindered rotation, orientational correlations, and dipole-induced-dipole and octupole-induced-dipole interactions, as well as the usual local field factors. The unimolecular contribution is associated with the narrow Lorentzian feature of the hyper-Rayleigh spectrum. The first hyper-polarizability β determined from the intensity of just the narrow Lorentzian feature of the liquid hyper-Rayleigh spectrum agrees with the gas phase value of β, but is 1⋅57 times smaller than the value obtained by including the entire liquid hyper-Rayleigh spectrum.