Phys. Rev. A 75, 063412 (2007) [7 pages]Gauge-equivalent intense-field approximations in velocity and length gauges to all ordersReceived 2 March 2007; published 14 June 2007 A gauge invariant formulation of the so-called intense-field Keldysh-Faisal-Reiss (KFR) approximations in the “velocity” and “length” gauges is given and their equivalence is demonstrated term by term to all orders of the theory. It overcomes a long standing discrepancy between the velocity and the length gauge strong-field KFR amplitudes for nonperturbative processes in intense laser fields. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.75.063412
DOI:
10.1103/PhysRevA.75.063412
PACS:
32.80.Rm, 32.80.Fb, 34.50.Fa, 42.50.Hz
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