N2 valence photoionization below and above the 1s−1 core ionization threshold

Abstract

The intensity of N2 valence photoionization into the three lowest ionic states is given on an absolute scale for photon energies spanning the 1s resonances and the 1s continuum. All three channels, i.e. 3σ−1g X, 1π−1u A and 2σ−1u B, show a coupling to the N 1s–π* resonance and their partial cross sections are characterized by asymmetric Fano profiles. Results for the photoionization of the 2σ−1u B state are compared with measurements of the B–X fluorescence yield. A coupling of the valence photoionization processes to the σ* shape resonance cannot be verified.