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Bimolecular reactions of S2+ with Ar, H2 and N2: reactivity and dynamics

Armenta Butt, Sam; Price, Stephen D; (2022) Bimolecular reactions of S2+ with Ar, H2 and N2: reactivity and dynamics. Physical Chemistry Chemical Physics 10.1039/d1cp05397c. Green open access

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Abstract

The reactivity, energetics and dynamics of bimolecular reactions between S2+ and three neutral species (Ar, H2 and N2) have been studied using a position-sensitive coincidence methodology at centre-of-mass collision energies below 6 eV. This is the first study of bimolecular reactions involving S2+, a species detected in planetary ionospheres, the interstellar medium, and in anthropogenic manufacturing processes. The reactant dication beam employed consists predominantly of S2+ in the ground 3P state, but some excited states are also present. Most of the observed reactions involve the ground state of S2+, but the dissociative electron transfer reactions appear to exclusively involve excited states of this atomic dication. We observe exclusively single electron-transfer between S2+ and Ar, a process which exhibits strong forward scatting typical of the Landau-Zener style dynamics observed for other dicationic electron transfer reactions. Following collisions between S2+ + H2, non-dissociative and dissociative single electron-transfer reactions were detected. The dynamics here show evidence for the formation of a long-lived collision complex, [SH2]2+, in the dissociative single electron-transfer channel. The formation of SH+ was not observed. In contrast, the collisions of S2+ + N2 result in the formation of SN+ + N+ in addition to the products of single electron-transfer reactions.

Type: Article
Title: Bimolecular reactions of S2+ with Ar, H2 and N2: reactivity and dynamics
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/d1cp05397c
Publisher version: https://doi.org/10.1039/D1CP05397C
Language: English
Additional information: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10145952
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