Shape-Resonance-Enhanced Nuclear-Motion Effects in Molecular Photoionization

Abstract

Shape resonances in molecular photoionization are shown to induce strong coupling between vibrational and electronic motion over a spectral range several times broader than the resonances half-width. This coupling is manifested by large deviations from Franck-Condon intensity distributions and strong dependence of photoelectron angular distributions on the vibrational state of the residual ion. These effects are illustrated for the $3{\sigma }_g$ photoionization channel of ${\mathrm{N}}_2$.