Theoretical study of the vibrationally resolved photoionization cross section for the valence shells of N₂ and CO

Vibrationally resolved cross section for the valence shell photoionization of N₂ and CO has been accurately measured experimentally up to 300 eV. Series of ratios between two vibrational cross sections (v-ratios) are compared to theoretical results obtained from a new ah initio DFT method that includes nuclear motion. It reveals strong oscillations around the Franck-Condon factor which are the fingerprints of double-slit like interferences. To support this point, a simple model (based on the Cohen-Fano formula) will be presented at the conference.