Dissociation of doubly and triply charged N2in strong laser fields

Abstract

In this paper, we study double- and triple-ionization-induced dissociation of N{sub 2}. With an improved temporal resolution of distinguishing neighboring channels in time-of-flight spectra, we observe two N{sup +} + N{sup +} states, a fast channel with a higher kinetic-energy release (KER) and a slow channel with a lower KER. The slow KER channel has not been seen in previous work. We also study triple-ionization-induced dissociation channel N{sup 2+} + N{sup +} by analyzing its intensity-dependent KER. Our study shows that the N{sup 2+} + N{sup +} channel is predominantly formed nonvertically through the low KER dissociation N{sup +} + N{sup +} state.