The dissociation pathways and isotope effects in intense field dissociation of and HD+

Abstract

The dissociation pathways and isotope effects in intense field dissociation of the homonuclear and its inhomonuclear isotope HD+ has been investigated by using an accurate 3D non-Born–Oppenheimer approach. The models of the photon-dressed states are presented to analyze the possible dissociation pathways of the and HD+ systems. Comparing the kinetic energy resolved spectra of and HD+, the dissociation pathways are clearly distinguished for the and HD+ molecules, and that are highly dependent on the laser intensity. Most importantly, the direct two-photon dissociation of HD+ occurs at the intensity of 2.0 × 1014 W cm−2, which is forbidden in the . However, it converts into the net one-photon dissociation as the laser intensity decreases to 4.0 × 1013 W cm−2. This conclusion could provide the scientific prediction and theoretical guidance to the experiment in the future.