Onsager reaction field theory values

The degree of clustering may be determined by a direct comparison of the experimental value of the solvatochromic parameter, for example. Ex, with the value which is calculated for a honx)geneous polarizable dielectric. Diis calculation has been done using the McRae-Bayliss nKxlel(221 which is based on the continuum reaction field theory of Onsager. 

In case (I), the theory that has been used to describe the EFISH analysis in earlier sections, the isolated molecule calculation provides the pz value and the internal field factors adjust the fields to allow for the polarization on the cavity surface. The elfect of reaction fields due to the additional polarization on the cavity walls induced by the permanent and induced dipoles on the central molecule is implicitly included in the low frequency Onsager field factor through the dielectric constant values. The choice of the high frequency dielectric constant ( o) in this formulation is rather ill defined and no account is taken of changes in the static or dynamic polarizabilities of the molecule as a result of the surrounding fields. 

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