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Journal Article

Strong-field approximation for intense-laser-atom processes: The choice of gauge


Bauer,  Dieter
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Bauer, D., Milosevic, D. B., & Becker, W. (2005). Strong-field approximation for intense-laser-atom processes: The choice of gauge. Physical Review A, 72(2): 023415. doi:10.1103/PhysRevA.72.023415.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-8866-5
The strong-field approximation (SFA) 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.