Asymmetric electron angular distributions in resonant dissociative photoionization ofH2with ultrashort xuv pulses

Abstract

Photoelectron angular distributions from fixed-in-space ${\text{H}}_{2}$ molecules exposed to ultrashort xuv laser pulses have been evaluated. The theoretical method is based on the solution of the time-dependent Schr\"odinger equation in a basis of stationary states that include all electronic and vibrational degrees of freedom. Asymmetric angular distributions are observed as a consequence of the delayed ionization from the ${\text{H}}_{2}$ doubly excited states, which induces interferences between gerade and ungerade ionization channels. The analysis of this asymmetry as a function of pulse duration can provide an estimate of the corresponding autoionization widths.