Strong-field approximation for intense-laser atom processes: the choice of gauge
arXiv:quant-ph/0504053 · doi:10.1103/PhysRevA.72.023415
Abstract
The strong-field approximation can be and has been applied in both length gauge and velocity gauge with quantitatively conflicting answers. For ionization of negative ions with a ground state of odd parity, the predictions of the two gauges differ qualitatively: in the envelope of the angular-resolved energy spectrum, dips in one gauge correspond to humps in the other. We show that the length-gauge SFA matches the exact numerical solution of the time-dependent Schrödinger equation.
5 pages, 3 figures, revtex4
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