Abstract
The problem of relating solvent-shift effects to excited-state polarizabilities is discussed. It is found that the chief difficulty is that of estimating the dispersion term in the interaction energy between a solvent molecule and a solute molecule, and it is shown that the differences in the values of excited-state polarizabilities which have been deduced from solvent-shift data are due to widely differing estimates of this dispersion term. In order to obtain meaningful results it is found necessary to assume that the change in the dispersion term is related to the change in the polarizability of a solute molecule on excitation. On the basis of this assumption, the use of a semi-empirical formula which connects solvent-shifts with these changes in the polarizability is discussed and it is found that the accuracy is such that very little useful information can be obtained.
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