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Ion momentum imaging study of the ion–molecule reaction Ar+ + O2 → Ar + O2+

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Abstract

Charge exchange reactions between Ar+(2P) and O2 (X3Σg) are investigated in the collision energy range of 3.40–9.24 eV within the center-of-mass coordinate, by using the ion momentum imaging technique. The internal energy of the product O2+ is enhanced gradually with the increase of collision energy, and the forward-scattered O2+ ions are distributed in the broader range of scattering angle at higher collision energies. At the low collision energy of 3.40 eV, the resonant charge transfer, similar to a photon ionization process, leads to the Franck–Condon-like vibrational state population of O2+ at the a4Πu state. At the higher collision energies, besides a4Πu and the high-lying states that are visible in the photoionization process, the O2+ products could be populated at some electronically bound states in the non-Franck–Condon region. The present observations indicate again the strong collision-energy dependences of the charge exchange reactions, but distinctly different from our previous findings for Ar+ + NO → Ar + NO+.

Graphical abstract: Ion momentum imaging study of the ion–molecule reaction Ar+ + O2 → Ar + O2+

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Article information


Submitted
21 Nov 2019
Accepted
07 Feb 2020
First published
07 Feb 2020

Phys. Chem. Chem. Phys., 2020, Advance Article
Article type
Paper

Ion momentum imaging study of the ion–molecule reaction Ar+ + O2 → Ar + O2+

C. Wu, J. Hu, M. He, Y. Zhi and S. X. Tian, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/C9CP06289K

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