https://doi.org/10.1140/epjd/e2011-20212-3
Regular Article
Gauge independent theory applied to a model of atomic ionization by an intense laser pulse
1 Departamento de Física and Instituto de Física de Buenos Aires, FCEyN, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
2 Centro Atómico Bariloche – Instituto Balseiro (Comisión Nacional de Energía Atómica y Universidad Nacional de Cuyo), 8400 S. C. Bariloche, Río Negro, Argentina
a e-mail: vladimir@df.uba.ar
Received: 11 April 2011
Received in final form: 28 June 2011
Published online: 6 October 2011
An explicitly gauge invariant strong field theory is introduced and tested using a model laser-atom interaction. The theory relies on a power series in the target potential. Transitions amplitudes are obtained by using a corresponding series in the momentum space wave function. We demonstrate that this approach is explicitly gauge invariant to all orders. A well know 1D delta function potential model is used to test the convergence of the series in the evaluation of total ionization probabilities and ionization spectra. Actually, the convergence is verified when both, the perturbation as well as the order of the expansion, are increased.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011
