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

Literature Information

Publication Date 2021-10-25
DOI 10.1039/D1CP03977F
Impact Factor 3.676
Authors

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


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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+(2Do), τ ≈ 3.6 hours), while no contributions from the second metastable state (O+(2Po), 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+(2Do) metastable state as well as channels involving the O(3s 5So) state.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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