Ion momentum imaging study of the ion–molecule reaction Ar+ + O2 → Ar + O2+. Issue 8 (13th February 2020)

• Record Type: Journal Article
• Authors: Wu, Chun-Xiao; Hu, Jie; He, Miao-Miao; Zhi, Yaya; Tian, Shan Xi
• Is Part Of: Physical chemistry chemical physics. Volume 22:Issue 8(2020)
• Page Start: 4640
• Page End: 4646
• Publication Date: 2020-02-13
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c9cp06289k
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : O2 + products of the charge exchange reactions between Ar + and O2 are distributed in the wider range of scattering angle at higher collision energy. Abstract : Charge exchange reactions between Ar + ( 2 P) and O2 (X 3 Σ−g) 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 a 4 Πu state. At the higher collision energies, besides a 4 Πu 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 + .