Polyatomic Electronic Spectra: Further Analysis of the Vibrations of the ¹B_2u State of Benzene

Abstract

IN a previous communication¹ we indicated how, in the example of the ¹B_2u state of C₆H₆ and C₆D₆, the product theorem and computations of force constants could be used to calculate or verify vibrational frequencies in electronically excited molecules. The discussion was almost entirely confined to the out-of-plane vibrations of both molecules, as insufficient experimental data were then available to permit calculations of the product ratios or force constants of the in-plane vibrations. It has now, however, been found possible to apply these methods to the in-plane vibrations, thus completing the first determination of a force system of an excited polyatomic molecule.