Abstract
The ionization and fragmentation dynamics of acetylene and the hydrogen molecule driven by strong short circularly polarized laser pulses are investigated within the framework of the time-dependent density-functional theory coupled with the Ehrenfest dynamics. The effects of alignment are considered and the dynamics is compared to that driven by linearly polarized pulses. It is found that the coupled ion-electron dynamics of both molecules driven by circularly polarized pulses follows the enhanced ionization mechanism, as was found in previous theoretical studies with linearly polarized pulses. A moderate localization asymmetry in the ionization dynamics of the hydrogen molecule was also found, in qualitative agreement with previous experimental investigations.
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