Depolarized Rayleigh scattering from simple molecular liquids: Investigation of transitions in the melt

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Abstract
Depolarized Rayleigh scatteringphotometry has been employed to study the temperature dependence of the optical anisotropy for benzene, hexafluorobenzene, and carbon tetrachloride. The depolarized Rayleigh intensity from carbon tetrachloride is entirely due to scattering by pairs of density fluctuations and increases monotonically with temperature. The total depolarized Rayleigh ratio R VH for benzene and hexafluorobenzene decreases smoothly and monotonically with temperature, in contradiction to a recent report [J. Chem. Phys. 95, 1223 (1991)]. The temperature dependence of the total depolarized Rayleigh ratio can be analyzed in terms of an increasing contribution due to scattering by pairs of density fluctuations and a decreasing contribution due to orientational fluctuations of optically anisotropic molecules. No anomalous behavior is observed anywhere in the liquid range for these three fluids.