Resonant effects in photoionization of H2 and D2

Abstract

We have evaluated photoionization cross sections of H2 and D2 with emphasis in resonant effects through intermediate doubly excited states. The theoretical method describes consistently the interference between resonant and nonresonant ionization processes, and includes both dissociative and nondissociative channels. We show that resonant peaks are rather apparent in vibrationally resolved spectra associated to the Σu+1 symmetry. In contrast, no resonant structure is observed in the total photoionization spectra, in agreement with recent experimental findings. Finally, we show that the ratios of dissociated to undissociated photoions strongly depend on resonant effects.