Laser effects in photoionization: Numerical solution for a one-dimensionalδpotential

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Abstract
The time-dependent Schrödinger equation was solved numerically, in one spatial dimension, for an electron bound initially (t) by a δ potential, and acted upon by a single-frequency classical electromagnetic field, turned on abruptly at t=0. The dipole approximation was invoked for the laser field, and magnetic interactions were ignored. Characteristic photoionization times were determined for a wide range of scaled laser intensities and scaled laser frequencies. The conditions under which well-defined quiver motion of the ionizing electron appears were clarified, and a spectrum of radiation emitted during the ionization process was determined. Above-threshold-ionization spectra of ionized electrons were also computed.