Abstract
We generalize earlier work [V.G. Stavros, E. Harel, S.R. Leone, J. Chem. Phys. 122 (2005) 064301] by illustrating the plausible role of ion gratings in time-dependent degenerate four-wave mixing (TD-DFWM) experiments in H 2. We postulate that at high laser intensities (10 14–10 15 W/cm 2), H 2 + /H + ions generate a static ion grating, it’s signature manifested in the transformation from homodyne- to heterodyne-detection of the TD-DFWM signal, depending on laser intensity. The change in signal detection agrees with the calculated intensity for barrier suppression ionization (BSI) in H 2 and the reported onset of saturation for H 2 + and H +, pointing towards the likely role of ion gratings in intense laser field, FWM experiments.
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