Generalized gauge-invariant formulations of the strong-field approximation

Details Generalized gauge-invariant formulations of the strong-field approximation Generalized gauge-invariant formulations of the strong-field approximation

2008-09-17

arxiv.org/abs/0809.2962v1

Physics

Atomic Physics

11 pages

Scientific paper

10.1103/PhysRevA.79.023421

The gauge problem in the so-called strong-field approximation (SFA) describing atomic or molecular systems exposed to intense laser fields is investigated. Introducing a generalized gauge and partitioning of the Hamiltonian it is demonstrated that the S-matrix expansion obtained in the SFA depends on both gauge and partitioning in such a way that two gauges always yield the same S-matrix expansion, if the partitioning is properly chosen.

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