Berlin 2005 – wissenschaftliches Programm

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A: Atomphysik

A 13: Poster HU 2

A 13.15: Poster

Dienstag, 8. März 2005, 08:30–18:30, Poster HU

Above-Threshold Ionization in the weakly relativistic regime — •Michael Klaiber, Karen Z. Hatsagortsyan, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Sauphercheckweg 1, D-69117 Heidelberg, Germany

A generalization of the analytical theory of above-threshold ionization (ATI) in the single active electron approximation is developed while taking into account of leading non-dipole and relativistic corrections in the starting Hamiltonian. Special interest is placed on the high energy part of the photoelectron spectrum which consists of a plateau and a characteristic cutoff. It is shown that the correction due to the magnetic component of the laser field gives rise to a decrease of the plateau height, to an increase of the maximal cutoff energy and a drift of the emitted electrons in propagation direction of the laser field. Furthermore, the influence of the relativistic mass shift may become nonneglible by reducing the cutoff energy significantly. Spin effects or the Zitterbewegung play a comparably minor role in the investigated parameter regime of sub-optical frequencies and high laser intensities.