Abstract
With the collinear model for H2+, we have numerically investigated the photoelectron spectrum of hydrogen molecular ions exposed to an ultrashort intense laser pulse. Above-threshold ionization (ATI) peaks and their temporal evolution are carefully analyzed. We find that once the photon-energy-spaced photoelectron peaks appear, their positions will not shift during the interaction. The stability of ATI spectrum is attributed to the fact that the Stark-shifted ionization potential of H2+ exhibits a minimum plateau during the internuclear distance Rc=3.6–6 bohr in which the stretching H2+ is significantly ionized.
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