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Schlagwörter:
Physics, Atomic Physics, physics.atom-ph,Quantum Physics, quant-ph
Zusammenfassung:
Aiming at the investigation of above-threshold ionization in super-strong
laser fields with highly charged ions, we develop a Coulomb-corrected strong
field approximation (SFA). The influence of the Coulomb potential of the atomic
core on the ionized electron dynamics in the continuum is taken into account
via the eikonal approximation, treating the Coulomb potential perturbatively in
the phase of the quasi-classical wave function of the continuum electron. In
this paper the formalism of the Coulomb-corrected SFA for the nonrelativistic
regime is discussed employing velocity and length gauge. Direct ionization of a
hydrogen-like system in a strong linearly polarized laser field is considered.
The relation of the results in the different gauges to the
Perelomov-Popov-Terent'ev imaginary-time method is discussed.