Phys. Rev. A 79, 023421 (2009) [7 pages]Generalized gauge-invariant formulations of the strong-field approximationReceived 15 September 2008; published 20 February 2009 The gauge problem in the so-called strong-field approximation (SFA) describing atomic or molecular systems exposed to intense laser fields is investigated. By 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.79.023421
DOI:
10.1103/PhysRevA.79.023421
PACS:
32.80.Rm, 33.80.Rv
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