Abstract
We present the photoelectron momentum distributions (PMDs) of helium, neon, and argon atoms driven by a linearly polarized, visible (527-nm) or near-infrared (800-nm) laser pulse (20 optical cycles in duration) based on the time-dependent density-functional theory (TDDFT) under the local-density approximation with a self-interaction correction. A set of time-dependent Kohn-Sham equations for all electrons in an atom is numerically solved using the generalized pseudospectral method. An effect of the electron-electron interaction driven by a visible laser field is not recognizable in the helium and neon PMDs except for a reduction of the overall photoelectron yield, but there is a clear difference between the PMDs of an argon atom calculated with the frozen-core approximation and TDDFT, indicating an interference of its -shell wave functions during the ionization. Furthermore, we find that the PMDs of degenerate states are well separated in intensity when driven by a near-infrared laser field, so that the single-active-electron approximation can be adopted safely.
3 More- Received 30 March 2017
DOI:https://doi.org/10.1103/PhysRevA.95.053419
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