Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 40: Strong laser fields - III
A 40.6: Vortrag
Donnerstag, 8. März 2018, 15:45–16:00, K 2.019
Coulomb-focusing in strong-field ionization and its effect in non-dipole interaction regime: analytical approach — •Jiří Daněk, Karen Z. Hatsagortsyan, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Heidelberg, Germany
Strong field ionization with mid-infrared lasers offers new possibilities, such as time-resolved photoelectron holography1, for atomic/molecular imaging. New discoveries, in particular the counterintuitive features of the photoelectron momentum distribution in the non-dipole regime2, have shown that detailed understanding of the role of the Coulomb field of the atomic core on the underlying dynamics is missing.
In this work we put forward a perturbative analytical framework, which allows us to account for the momentum transfers between the electron and the atomic core. We restrict the interaction to specific and well defined recollision points on the electron’s classical trajectory and obtain an analytical description of the final electron’s momentum and hence of Coulomb focusing. Furthermore, we demonstrate the capability of our framework by analyzing the modification of the Coulomb focusing due to non-dipole effects. The latter allows us to explain the mechanism behind the energy-dependent counterintuitive bend of the cusp of the photoelectron momentum distribution in a linearly polarized mid-infrared laser fields.
1 Y. Huismans et al., Science, 331, 61 (2011).
2 A. Ludwig et al., Phys. Rev. Lett. 113, 243001 (2014).