Hamburg 2009 – scientific programme
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A: Fachverband Atomphysik
A 9: Interaction with Strong or Short Laser Pulses I
A 9.3: Talk
Tuesday, March 3, 2009, 11:30–11:45, VMP 6 HS-C
Coulomb-corrections for strong field ionization using quantum trajectories — •Dieter Bauer1 and Sergey Popruzhenko1,2 — 1Max-Planck-Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany — 2Moscow State Engineering Physics Institute, Kashirskoe Shosse 31, 115409, Moscow, Russia
A theory describing above-threshold ionization of atoms and ions in a strong electromagnetic field is presented [1]. It is based on the widely known strong field approximation and incorporates the Coulomb interaction between the photoelectron and the nucleus using the method of complex classical trajectories. By comparing our predictions with the results of ab initio numerical solutions we show that the new theory provides a significant improvement over the Coulomb-free strong field approximation [1,2]. Moreover, with the same method a simple, analytical, nonrelativistic ionization rate formula for atoms and positive ions in intense ultraviolet and x-ray electromagnetic fields is derived. The rate is valid at arbitrary values of the Keldysh parameter and confirmed by results from ab initio numerical solutions [3]. The proposed rate is particularly relevant for experiments employing the new free electron laser sources.
[1] S.V. Popruzhenko and D. Bauer, J. Mod. Opt. 55, 2573 (2008).
[2] S.V. Popruzhenko, G.G. Paulus, and D. Bauer, Phys. Rev. A 77, 053409 (2008).
[3] S.V. Popruzhenko, V.D. Mur, V.S. Popov, and D. Bauer, Phys. Rev. Lett. 101, 193003 (2008).