Düsseldorf 2007 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Atomic Systems in External Fields I
A 15.2: Vortrag
Mittwoch, 21. März 2007, 11:45–12:00, 5M
Laser-assisted bremsstrahlung — •Erik Lötstedt, Stephan Schnez, Ulrich D. Jentschura, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg
We present calculations of the cross section for laser-assisted bremsstrahlung, the first numerical evaluation of a second-order quantum electrodynamic process with the Dirac-Volkov propagator in a strong laser field [1]. In this process an electron in a strong laser field collides with a nucleus and emits a non-laser mode photon. The electron-laser interaction can be treated exactly by using the analytical solutions and propagators of the Dirac equation in an external plane-wave field, while the interaction with the nucleus and the emitted photon is taken into account perturbatively. Numerical results are presented for laser intensities of order 1021 W/cm2, for both circular and linear polarization of the laser. In particular we show that this process is resonant, due to the periodic nature of the laser, and we mention how to deal with these resonances. Finally, we discuss pair creation by photon absorption in the field of a nucleus and a laser, which is related to laser-assisted bremsstrahlung by a crossing symmetry.
[1] E. Lötstedt, U. D. Jentschura, and C. H. Keitel, Phys. Rev. Lett. (in press)