THE THEORY OF ELECTRONIC INTENSITY IN SOLUTION OR CONDENSED MEDIA

Based on microscopic and macroscopic models for the description of the electronic intensity of an ensemble of absorbing molecules in solution or condensed media, rigorous and general expressions have been derived for the integral Einstein B coefficient and the oscillator strength by means of the classical and the quantum mechanical methods. The two approaches are shown to yield in all essential points the same results. The present expressions are formulated to accommodate various field models and molecular shapes and to permit the distinction and/or selection of a model that best describes a spectroscopic or molecular property or the physical condition of the molecular ensemble. The merit of the present description relative to some previous derivations is examined. © 1990 American Institute of Physics.