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Abstract
Based upon the molecular light scattering theory of Kielich [8], the second order light scattering caused by the optical dipole interaction in the liquid state is derived. In the general case of molecules with anisotropic polarizability the isotropic and anisotropic Rayleigh factors of the second order scattering are written explicitly in terms of the two parts representing the DID interaction (A) and the self reaction (B). By considering a simple model of shell structure of the liquid state, an extinction factor is introduced which reduces the class A of scattering and which depends on structural parameters of the liquid state (i.e. the mean values of the coordination number, of the number of holes in the first shell and the radial pair distribution function).
Applied to liquids with spherical molecules, and with reasonable assumptions about the structural parameters, the anisotropic Rayleigh factor can be predicted in close agreement with the experimental value, as has been demonstrated for carbon tetrachloride.
For various other organic liquids composed of anisotropic molecules the calculated anisotropic scattering of the second order contributes up to about 90 per cent relative to the total anisotropic scattering, whereas for the isotropic scattering the second order portion amounts to about 3 per cent.