Absorption and refraction of radiation by liquids. II. Solvent effects on the absorption intensity

Abstract

Absorption intensities are given in terms of the vapour phase solute transition dipole moment, and the dielectric properties of the solvent. The Chako factor is derived from perturbation theory and shown to be due to off-resonance excitation exchange between the solute and the solvent. A complete first-order perturbation correction is made to the transition dipole moment and applied to the calculation of the intensification factor. The calculated and observed solvent intensifications are compared for strongly and weakly absorbing systems.