Emergence of classical orbits in few-cycle above-threshold ionization of atomic hydrogen.
The time-dependent Schrödinger equation for atomic hydrogen in few-cycle laser pulses is solved numerically. Introducing a positive definite quantum distribution function in energy-position space, a straightforward comparison of the numerical ab initio results with classical orbit theory is facilitated. Integration over position space yields directly the photoelectron spectra so that the various pathways contributing to a certain energy in the photoelectron spectra can be established in an unprecedented direct and transparent way.
Bauer
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Max-Planck-Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany.