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Low-pressure Kr and Xe gas has been irradiated by a high-intensity (3×{}10¹²-10¹⁴ W cm^-2), short-pulse (1.3 ps), tunable uv laser beam. Enhancement of the Kr⁺ yield by 2 orders of magnitude by three-photon-resonant four-photon ionization is observed at intensities 1 to 2 orders of magnitude above previous results. The 4p→5d[1/2]₁ and 4p→4d[3/2]₁ three-photon Kr resonance profiles are measured as functions of peak laser intensity and are well fitted by a simple model incorporating line shifts and widths scaling linearly with laser intensity.
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Landen et al. (1987) studied this question.
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