Abstract
Classical orientation theories of rigid molecules in electro-optic fields are reexamined and significantly improved. Firstly a more consistent evaluation of local field effects is made within the practical spherical model by introducing approximations at the end of theoretical calculations only. This modification does not change classical formulae for refraction (Lorentz-Lorenz) and light scattering (depolarized Rayleigh intensity), but polarization and electric birefringence formulae are modified. Secondly a more correct derivation allows us to obtain a general expression of the light scattered intensity applicable both to dense fluids and to the perfect gas. Thirdly a more rigourous expression of the density fluctuation term is deduced without any approximation about the local field. The four electro-optic formulae are applied successfully to several liquids.
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