Role of Molecular Interaction in Anisotropic Light Scattering by Liquids

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Abstract
The influence of molecular linear and nonlinear polarizability,anisotropy, shape, radial and angular correlations, and other microscopic factors on anisotropiclight scattering is discussed for some models of a liquid within the framework of statistical—molecular theory. An effective optical anisotropy Δ2 is introduced and computed numerically for several liquids from the experimental depolarization ratio Du and optical birefringence constant B λ; for strongly anisotropic substances, this yields Δ2 values almost twice smaller than those determined from the anisotropic Rayleigh ratio R anis. Theoretical, numerical computations of Δ2 basing on the ellipsoidal Lorentz and Onsager—Scholte models result in values close to those from Du and B λ. Finally, the isotropic and anisotropic parts of the refractive index variation due to intense laser light are related, respectively, with the isotropic and anisotropic Rayleigh ratios, by means of which numerical computations are made for various liquids.