Accurate treatment of photodissociation of H2+ in strong laser field

The photodissociation of H2+ by an intense laser pulse is investigated by solving the close coupled equations without discretezation. The photodissociation spectra are calculated under the condition mimicking the experiment done by Sanding et al. and fairly good agreement obtained. The influence of the uncertainty in the relative phases of initial states is found to lead to somewhat of smoothing of the spectra depending on the laser intensity and pulse width. It is also found that Raman type transitions via intermediate dissociation continuum play an important role in determining photodissociation spectra. This effect leads to population increase of lower vibrational states and deforms spectral profile. The dissociation from the lower vibrational states due to bond softening cannot be good enough. The calculated results of the photodissociation spectra are presented in three-dimensional plot by introducing the field intensity as an extra axis. This is helpful for clearly understanding the dependence of photodissociation dynamics on the laser parameters.