ELECTRONIC-TRANSITIONS IN METALLOCENES BY RESONANCE RAMAN-SCATTERING .1. ANALYSIS OF THE FERROCENE SPECTRUM IN THE VISIBLE REGION

Resonance Raman (RR) spectra of ferrocene in three different solvents have been measured and the excitation profiles for two totally symmetric molecular vibrations derived. These latter have also been reproduced by calculations together with the visible absorption spectrum. The model we used in these calculations, based on the non-adiabatic vibronic-coupling approach, is presented and discussed. As compared wlth previous publications, the results lead to a slightly different assignment of the electronic transitions in the low-energy region of the visible absorption.