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Electron capture in low-energy collisions of Sn3+ ions with H2 and D2

K. Bijlsma1,2, E. de Wit1,2, J. L. Pascual3, A. Kleinsmit1, E. Lalkens1, L. Assink1,2, M. Salverda1,2, L. Méndez4, O. O. Versolato2,5 et al.

I. Rabadán4 and R. Hoekstra1,2

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Phys. Rev. A 112, 052806 – Published 5 November, 2025

DOI: https://doi.org/10.1103/x84b-5kcn

Abstract

We report experimental single-electron-capture cross sections for Sn3+ ions impacting on H2 and D2 molecules at low projectile energies, ranging from 0.8 to 153 eV/u. The data were obtained in a crossed-beam-type experiment with a decelerated Sn3+ ion beam and a H2 (D2) gas target. Charge-state resolved Sn ion currents are measured with a retarding field analyzer. After an extensive description of the setup and measurement procedure, we present and discuss the results in comparison to model calculations. Ab initio calculations of potential energy curves, including spin-orbit interactions, are performed and used to fit a four-state diabatic model. The experimental and theoretical single-electron-capture cross sections show good agreement and are found to have values in the range of 20–45×10−16cm2 with a shallow maximum around 10 eV/u. We do not observe a significant difference between the cross sections for H2 and D2, as hinted at in our previous work at energies of 80–400 eV/u.

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Phys. Rev. A 112, 052806– Published 5 November, 2025
  • Received 26 June 2025
  • Accepted 10 September 2025
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