Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 7: Interaction with strong or short laser pulses
A 7.1: Hauptvortrag
Montag, 11. März 2019, 14:00–14:30, S HS 3 Physik
Multielectron polarization effects and ionization of the hydrogen molecule within the semiclassical two-step model — •Nikolay Shvetsov-Shilovski1, Manfred Lein1, Lars Madsen2, and Karoly Tokesi3 — 1Leibniz Universität Hannover, Hannover, Germany — 2Aarhus University, Aarhus, Denmark — 3Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary
The semiclassical two-step model (SCTS) for strong-field ionization describes quantum interference and accounts for the ionic potential beyond the semiclassical perturbation theory [1]. We extend the SCTS model to take into account multielectron polarization effects [2]. We predict a pronounced narrowing of the longitudinal momentum distributions due to the polarization-induced focusing of photoelectrons. We show that the polarization of the core also modifies interference structures in the photoelectron momentum distributions.
Furthermore, we apply the SCTS model to ionization of the hydrogen molecule. In the simplest case of the molecule oriented along the polarization direction of a linearly polarized field, we predict significant deviations in the electron momentum distributions from the case of atomic hydrogen.
[1] N. I. Shvetsov-Shilovski, M. Lein, L. B. Madsen et al., Phys. Rev. A 94, 013415 (2016).
[2] N. I. Shvetsov-Shilovski, M. Lein, and L. B. Madsen, Phys. Rev. A 98, 023406 (2018).