Fhm. Faisal et T. Radozycki, 3-DIMENSIONAL RELATIVISTIC MODEL OF A BOUND PARTICLE IN AN INTENSE LASER-PULSE .2., Physical review. A, 48(1), 1993, pp. 554-557
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 x 10(14) W/cm2
to 10(20) W/cm2, and compare them with the predictions of the Schrodi
nger theory. The present calculations also allow us to test an approxi
mation for relativistic intensities, which should be useful for real s
ystems.