Darmstadt 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Fachverband Atomphysik
A 8: Interaction with intense laser pulses II: Molecules and beyond
A 8.6: Vortrag
Dienstag, 11. März 2008, 15:30–15:45, 3C
Laser-assisted pair creation — •Erik Lötstedt, Ulrich D. Jentschura, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg
We present results on the laser-assisted Bethe-Heitler pair creation process. With Bethe-Heitler pair creation is understood the process where an electron-positron pair is created by a photon with energy ℏω in the vicinity of a nucleus. We study the modification of this process in the presence of a strong laser field, however with a peak electric field strength below the critical Schwinger field. The matrix element is related to that of laser-assisted bremsstrahlung [1,2] by a crossing symmetry. Especially interesting is here the transition from ℏ ω < 2mc2, where the process is laser-induced, to the laser-assisted case where ℏ ω > 2mc2. Here ω is the angular frequency of the non-laser mode photon, and m the electron mass. Also treated is a novel algorithm for the numerical evaluation of generalized Bessel functions, a type of special function occurring in the theoretical description of laser-matter interaction.
[1] E. Lötstedt, U. D. Jentschura, and C. H. Keitel, Phys. Rev. Lett. 98, 043002 (2007).
[2] S. Schnez, E. Lötstedt, U. D. Jentschura, and C. H. Keitel, Phys. Rev. A 75, 053412 (2007).