Electron Capture from Molecular Hydrogen by Metastable Sn2+* Ions

Klaas Bijlsma, Lamberto Oltra, Emiel de Wit, Luc Assink, Ismanuel Rabadán, Luis Méndez, Ronnie Hoekstra*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Over a wide and partly overlapping energy range, the single-electron capture crosssections for collisions of metastable Sn2+(5s5p
) (Sn2+∗
) ions with H2 molecules were measured
(0.1–10 keV) and calculated (0.3–1000 keV). The semi-classical calculations use a close-coupling
method on a basis of electronic wavefunctions of the (SnH2)
2+ system. The experimental crosssections were extracted from double collisions in a crossed-beam experiment of Sn3+ with H2. The
measured capture cross-sections for Sn2+∗
show good agreement with the calculations between
2 and 10 keV, but increase toward lower energies, whereas the calculations decrease. Additional
Landau–Zener calculations were performed and show that the inclusion of spin-orbit splitting cannot
explain the large cross-sections at the lowest energies which we now assume to be likely due to
vibrational effects in the molecular hydrogen target.
Original languageEnglish
Article number9
Number of pages11
Issue number2
Publication statusPublished - 1-Feb-2024

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