Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 21: Interaction with strong or short laser pulses

A 21.2: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Beyond the dipole approximation for Coulomb focusing of tunnelled electrons in intense laser fields — •Jiří Daněk, Karen Z. Hatsagortsyan, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland

In recent experiments, the breakdown of the dipole approximation in strong-field ionization was demonstrated and the important role of magnetic field on the photoelectron spectra (PES) was investigated. Although many simulations are in agreement with the experiments, a comprehensible theoretical picture is still missing even for rather simple atoms. Meanwhile, the full understanding of the nondipole effects on the PES is essential for further development of the holography for atoms.

In our poster, we present quasi-classical Monte Carlo simulation for xenon atom in a strong mid-infrared laser field with linear polarization beyond the dipole approximation. We demonstrate how the magnetic component of the laser field influences the Coulomb focusing and modifies the final PES with respect to the dipole case. The modified PES shows a “bend” in the opposite direction towards the magnetic pressure caused by the laser field. This seemingly counterintuitive feature is explained as a modification of the Coulomb focusing under the magnetic force in the well known recollision picture.