https://doi.org/10.1140/epjs/s11734-026-02358-z
Regular Article
State-selective single electron capture in intermediate energy He
–Ar collisions
1
Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
2
University of Chinese Academy of Sciences, 100049, Beijing, China
a
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b
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Received:
12
January
2026
Accepted:
24
April
2026
Published online:
7
May
2026
Abstract
State-selective single electron capture has been investigated in collisions between 
ions and Ar atoms at energies of 30, 62.5, and 100 keV/u, using high resolution reaction microscope (ReMi). The Q-value spectra, state-selective cross sections, and scattering angle distributions are obtained. The results show that pure single electron capture (PSEC) into the n 
2 and n 
3 states is dominant at low impact energy, while the transfer target excitation (TTE) process becomes dominant at high impact energy. The total cross sections of TTE are found to be comparable to those of PSEC. A comparison of the experimental scattering angle distributions with theoretical results calculated by molecular Coulombic over-barrier model (MCBM) shows that correlated two-electron transitions play a vital role at high impact energies.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2026
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.
