Generalization of the Keldysh theory of above-threshold ionization for the case of femtosecond pulses
Jonathan Parker and C. R. Stroud, Jr.
Phys. Rev. A 40, 5651 (1989).
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We develop a theory of the Keldysh-type appropriate for femtosecond
excitation of atomic hydrogen. The new theory is tested by comparison with
results of a direct numerical integration of the three-dimensional
Schrödinger equation. In the case studied it is found that several of
the standard approximations used in Keldysh calculations and in Fermi
golden rule calculations are not valid. In particular, the slowly varying
population approximation is not valid, and inhibition of ionization by
coherent population trapping can occur.
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