Abstract
We present theoretical results from the solution of a widely used model atom containing two interacting electrons in one dimension bound to a soft-Coulomb potential and ionized by an intense, short laser pulse. A half-cycle pulse leads to strong single but no double ionization (down to a probability density of 10−12). A full-cycle laser pulse at low frequency leads to double ionization which begins precisely at the classical return time for the first ejected electron. At weak field, double ionization occurs at the time of maximum return kinetic energy. When the excursion range for the first electron is truncated, the double ionization at later times, corresponding to longer excursions, disappears. When the field near the nucleus is turned off during the return of the first electron, double ionization persists.
Published Version
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