Abstract
We have used a wavefunction-modified Ammosov–Delone–Krainov (ADK) method to calculate the ionization rates of H2, N2 and CO2 as a function of initial vibrational level of the molecules. A strong increase in the ionization rate, with vibrational level, is found for H2, while N2 and CO2 show a lesser increase. We have also compared the enhancement ratios between the ground and excited vibrational levels obtained from (1) a focal-volume averaged ADK procedure and (2) simple over-the-barrier calculations, and found dramatic differences in ionization dependence on vibrational levels for the different molecules.
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