Shape-resonance-induced non-Franck-Condon vibrational intensities in 3 σ_gphotoionisation of N₂

Abstract

Reports a broad pattern of non-Franck-Condon vibrational intensities extending over about 25 eV of the 3 sigma g photoionisation continuum of N2. The effect was recently predicted theoretically to arise from shape-resonance-enhanced coupling between electronic and nuclear motion. Here experiment and theory are compared directly for the first time. Qualitative agreement verifies the basic theoretical concept, yet significant quantitative differences indicate the need for further work.