Using an exactly solvable model of a bound Klein-Gordon particle in an intense laser field we obtain the above-threshold energy spectra of the ejected electron for intensities in the range I=7×{}10¹⁴ W/cm² to 10²⁰ W/cm², and compare them with the predictions of the Schr\"odinger theory. The present calculations also allow us to test an approximation for relativistic intensities, which should be useful for real systems.
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Faisal et al. (1993) studied this question.
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