https://doi.org/10.1140/epjd/s10053-025-01047-1
Regular Article - Atomic and Molecular Collisions
Theoretical study on resonant transfer and excitation process of hydrogen-like and helium-like ions
1
Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, 730070, Lanzhou, People’s Republic of China
2
School of Science, Lanzhou University of Technology, 730050, Lanzhou, China
a
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Received:
7
May
2025
Accepted:
29
July
2025
Published online:
21
August
2025
Abstract
The resonant transfer and excitation plus X-ray emission (RTEX) process are studied systematically for H-like and He-like ions in the impulse approximation. The detailed RTEX cross sections are presented for 14 elements, including C, N, O, Ar, Ca, Fe, Cu, Kr, Mo, Sn, Cs, Au, Bi, and U colliding with H2, H2O, and Ar targets. The calculated results agree well with both available experimental and other theoretical values, except for Ca19+ + H2 collisions, in which a significant discrepancy between the experiments is observed. The RTEX cross sections of H-like ions are found decreasing with increasing of the nuclear charge Z. Similar variation trend of cross sections as the case of H-like ions are observed for high-Z He-like ions, while for low-Z He-like C4+, N5+, and O6+ ions, the RTEX cross sections increase with increasing nuclear charge Z. The electron momentum distribution (Compton profile) of targets are found significantly influencing the RTEX cross sections, for the same projectile ion colliding with H2, H2O, and Ar targets, respectively, the cross sections σAr > σ
> σ
are shown for dominant resonant peaks.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2025
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.
