Abstract
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.
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