https://doi.org/10.1140/epjd/s10053-023-00685-7
Regular Article – Atomic and Molecular Collisions
Influence of the phase of the electromagnetic field on the processes of charge transfer and ionization in laser-assisted collisions of protons with hydrogen atoms
Department of Physics, St. Petersburg State University, 7-9 Universitetskaya nab, 199034, St. Petersburg, Russia
Received:
24
February
2023
Accepted:
26
May
2023
Published online:
6
June
2023
We perform a theoretical and computational study of laser-assisted collisions of protons with hydrogen atoms. The incident proton energy is equal to 0.25 keV, and the laser field is linearly polarized with the frequencies in the infrared (
= 0.01 a.u.) and extreme ultraviolet ( = 2 a.u.) regions of the spectrum. For the infrared laser field, we use the peak intensities 
W/cm
and 
W/cm
while for the extreme ultraviolet field the peak intensity is equal to 
W/cm. Our study is focused on the influence of the phase of the laser field on the ionization and charge transfer probabilities. For the infrared laser field and small impact parameters (0.125-
1.5 a.u), our results demonstrate a strong dependence of the charge transfer and ionization probabilities on the phase of the field at the moment when the proton approaches the hydrogen atom most closely. On the contrary, for the field in the extreme ultraviolet region, the charge transfer and ionization probabilities do not depend on the phase of the field irrespective of the impact parameter value.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
