Abstract
It is shown that the derivation of equations of P olo and W ilson and of M allard and S traley for solvent effects in vibrational spectroscopy does not take into account the change of molecular polarizability during vibrations. This change can be accounted for by considering the effective dipole moment and polarizability of solute molecule, as given by O nsager's theory of dielectric polarization, and their derivatives with respect to the normal coordinate. In this way new equations are derived for solvent effects on infra-red and Raman intensities.
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