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A: Atomphysik

A 20: Poster II: Atomare Systeme in starken Laserpulsen und statischen Feldern

A 20.19: Poster

Donnerstag, 16. März 2006, 16:30–18:30, Labsaal

Relativistic gauge-invariant strong-field approximation for Above-Threshold Ionization — •Michael Klaiber, Karen Z Hatsagortsyan, and Christoph H Keitel — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg

A gauge-invariant version of the strong-field approximation is developed for the relativistic treatment of Above-Threshold Ionization (ATI). The gauge invariance is achieved by means of employment of an eigenstate of the physical energy operator for the initial atomic state. Both a comparison and analysis of predictions of the gauge-invariant theory with usual not gauge-invariant results are given for direct ionized electrons. Further we expand the model based on the Klein-Gordon equation by including rescattering of the ionized electron in the relativistic regime.