Effective optical anisotropy of polar molecules from Rayleigh light scattering studies

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Abstract
The effective optical anisotropy of polar molecules is calculated to within the second approximation of statistical perturbation calculus taking into account dispersional, dipole-dipole, dipole-quadrupole, quadrupole-quadrupole, induced dipole-dipole and induced dipole-quadrupole interactions as well as molecular redistribution. Three-molecule radial interaction is considered, leading to a very large reduction in the effect of two-molecule radial interaction. The model of favoured two-molecule configuration is analyzed for rod- and plate-like polar molecules, and numerical calculations are performed for the liquids CH3CN and CHCl3, the molecules of which exhibit, respectively, positive and negative intrinsic anisotropy of polarizability. The calculations are compared with the available experimental data, and the percentage of molecules forming privileged pairs in the liquid is determined