Double multiphoton ionization of a model atom
- 1 February 1997
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 55 (2) , 1307-1313
- https://doi.org/10.1103/physreva.55.1307
Abstract
A direct solution of the time-dependent Schrödinger equation (TDSE) for a two-electron model atom in a strong electromagnetic field is used to extract probabilities for both single and double electron ionization. For three-photon ionization at a moderately strong intensity, the TDSE calculations find single ionization at 62%, single ionization with excitation at 10%, and double ionization at 3%. The sequential process of escape from an already once ionized atom is found to make a substantial contribution to the double-ionization probability. Multiphoton-ionization probabilities are also obtained from a solution of the time-dependent unrestricted Hartree-Fock (TDUHF) equations for the same model atom. Although in qualitative agreement with the TDSE results, the TDUHF results show significantly less single ionization with excitation and have a different angular distribution for double ionization.Keywords
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