Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 19: Interaction with strong or short laser pulses II
A 19.1: Invited Talk
Wednesday, March 11, 2020, 14:00–14:30, f107
Fragmentation of HeH+ in strong laser fields — •Florian Oppermann1, Philipp Wustelt2, Saurabh Mhatre3, Stefanie Gräfe3, Gerhard G. Paulus2, and Manfred Lein1 — 1Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover, Deutschland — 2Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Deutschland — 3Institut für Physikalische Chemie, Friedrich-Schiller-Universität Jena, Helmholtzweg 4, 07743 Jena, Deutschland
Our previous study of ionization and double ionization of HeH+ in strong 800 and 400nm laser pulses has shown the important role of nuclear motion before and during the electron removal [1]. Here we move our focus to laser parameters where both dissociation and ionization are of comparable probability. According to simulations, this implies wavelengths around 1 to 2µm. For fixed molecular orientation the ratio ionization/dissociation can be controlled (sometimes even reversed) via the relative phase in a collinearly polarized ω-2ω laser pulse.
A Keldysh parameter can be defined not only for the ionization of HeH+ but also for the dissociation process [2]. The ratio of the two Keldysh parameters is roughly 10, i. e. one pathway can be placed in the multi-photon regime while the other one is in the tunneling regime. Thus by changing the two-color delay on a subcycle scale the dominating process can be switched from multi-photon to tunneling and back.
[1] Wustelt et al., Phys. Rev. Lett. 121, 073203 (2018)
[2] Ursrey et al., Phys. Rev. A 85, 023429 (2012)