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Atomic hydrogen in a strong optical radiation field.

Experimental energy spectra and energy-resolved angular distributions of photoelectrons produced by multiphoton ionization of atomic hydrogen are presented for several wavelengths bewteen 596 and 630 nm, peak intensities of about 10[sup 14] W/cm[sup 2], and laser pulse durations of about 0.5 ps. Resonant ionization processes via ac Stark-shift-induced resonances with excited states dominate the spectra. The results of Sturmian-Floquet calculations of these spectra and angular distributions are presented; they are in fair agreement with the experimental data.