Effects of Shape Resonances on Vibrational Intensity Distributions in Molecular Photoionization

Abstract

We report striking non-Franck-Condon vibrational intensity distributions associated with the shape resonance in the $5\ensuremath{\sigma}$ photoionization channel of CO. This example confirms the recent theoretical prediction that shape resonances will couple significantly with vibrational motion, leading to different resonance energies and profiles, and non-Franck-Condon intensities in alternative vibrational channels. Analogous effects are expected in connection with the widespread occurrence of shape resonances in both innershell and outershell molecular photoionization spectra.