Mutual neutralisation of O+ with O−: investigation of the role of metastable ions in a combined experimental and theoretical study

Mathias Poline; Arnaud Dochain; Stefan Rosén; Jon Grumer; MingChao Ji; Gustav Eklund; Ansgar Simonsson; Peter Reinhed; Mikael Blom; Nicholas S. Shuman; Shaun G. Ard; Albert A. Viggiano; Mats Larsson; Henrik Cederquist; Henning T. Schmidt; Henning Zettergren; Xavier Urbain; Paul S. Barklem; Richard D. Thomas

doi:10.1039/D1CP03977F

Mutual neutralisation of O⁺ with O⁻: investigation of the role of metastable ions in a combined experimental and theoretical study

Mathias Poline,

*^a Arnaud Dochain,^b Stefan Rosén,^a Jon Grumer,

^c MingChao Ji,

^a Gustav Eklund,

^a Ansgar Simonsson,^a Peter Reinhed,^a Mikael Blom,^a Nicholas S. Shuman,^d Shaun G. Ard,^d Albert A. Viggiano,^d Mats Larsson,^a Henrik Cederquist,^a Henning T. Schmidt,

^a Henning Zettergren,^a Xavier Urbain,

^b Paul S. Barklem

^c and Richard D. Thomas

*^a

Author affiliations

* Corresponding authors

^a Department of Physics, Stockholm University, AlbaNova, Stockholm, Sweden
E-mail: mathias.poline@fysik.su.se, rdt@fysik.su.se

^b Institute of condensed Matter and Nanosciences, Université catholique de Louvain, Louvain-la-Neuve, Belgium

^c Theoretical Astrophysics, Department of Physics and Astronomy, Uppsala University, Box 516, S 75120, Uppsala, Sweden

^d Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, NM 87117, USA

Abstract

The mutual neutralisation of O⁺ with O⁻ has been studied in a double ion-beam storage ring with combined merged-beams, imaging and timing techniques. Branching ratios were measured at the collision energies of 55, 75 and 170 (± 15) meV, and found to be in good agreement with previous single-pass merged-beams experimental results at 7 meV collision energy. Several previously unidentified spectral features were found to correspond to mutual neutralisation channels of the first metastable state of the cation (O⁺(²D^o), τ ≈ 3.6 hours), while no contributions from the second metastable state (O⁺(²P^o), τ ≈ 5 seconds) were observed. Theoretical calculations were performed using the multi-channel Landau–Zener model combined with the anion centered asymptotic method, and gave good agreement with several experimentally observed channels, but could not describe well observed contributions from the O⁺(²D^o) metastable state as well as channels involving the O(3s ⁵S^o) state.

This article is part of the themed collection: 2021 PCCP HOT Articles

Physical Chemistry Chemical Physics

Mutual neutralisation of O⁺ with O⁻: investigation of the role of metastable ions in a combined experimental and theoretical study

Abstract

Article information

Download Citation

Permissions

Mutual neutralisation of O⁺ with O⁻: investigation of the role of metastable ions in a combined experimental and theoretical study

Social activity

Search articles by author

Spotlight

Advertisements