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A: Atomphysik

A 16: Multiphotonionisation I

A 16.7: Gruppenbericht

Donnerstag, 25. März 2004, 15:30–16:00, HS 133

QED and non-dipole effects in strong laser-matter interaction — •U. D. Jentschura, G. Mocken, A. Staudt, J. Evers, M. Haas, M. Klaiber, M. Ruf, and C. H. Keitel — Theoretische Quantendynamik, Universität Freiburg

The theoretical description of relativistic effects and quantum electrodynamic corrections to dynamical processes is necessitated by the ever growing light intensity available at today’s laser facilities [1]. The dynamical character of the laser-induced processes leads one naturally to the question: Standard S-matrix theory tells what is going on in the distant past as well as in the distant future, but what is going on in the middle? The answer is provided by numerical simulations of electrons in super-intense fields, including quantum relativistic effects [2]. These allow for an accurate understanding of the electron motion in an intense field, including rescattering. A further aspect of considerable theoretical interest are radiative corrections to dynamical processes in the region of the interplay between the strong atom-laser coupling, and the relatively weak interaction of the atom with the virtual quanta of the radiation field. A careful analysis leads to nontrivial modifications of the Lamb shift [3] which can only be understood if the problem is treated within the framework provided by laser-dressed states.

[1] C. J. Joachain, M. Dörr, und N. Kylstra, Adv. Atom. Mol. Opt. Phys. 42, 225-286 (2000).

[2] G. Mocken und C. H. Keitel, Phys. Rev. Lett. 91, 173202 (2003).

[3] U. D. Jentschura, J. Evers, M. Haas, und C. H. Keitel, Phys. Rev. Lett., in press (2003/2004).