Abstract
Multiphoton ionization of the H 2+ hydrogen molecular ion at fixed internuclear distance is investigated in the lowest order perturbation theory (LOPT). The parallel and perpendicular orientations between the polarization laser vector of the electric field and the H 2+ internuclear axis direction are considered. We calculate the generalized cross sections for the N = 2 to N = 6 photon ionization processes and we identify in each case the intermediate-state resonances. We show the efficiency of our method to describe resonance structures with high-energy resolution.
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