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Isotope effect for the mutual neutralization reaction at low collision energies: He++H−

A. Dochain1,2,*, V. M. Andrianarijaona3, and X. Urbain1,†

  • 1Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
  • 2Department of Physics, Stockholm University, Stockholm 10691, Sweden
  • 3School of Engineering and Physics, Southern Adventist University, Collegedale, Tennessee 37315, USA

  • *arnaud.dochain@fysik.su.se
  • †xavier.urbain@uclouvain.be
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Phys. Rev. A 108, 042809 – Published 16 October, 2023

DOI: https://doi.org/10.1103/PhysRevA.108.042809

Abstract

We measured the branching ratios of the He++H− and He++D− mutual neutralization at a collision energy below 25 meV. Those are correctly reproduced using the Landau-Zener model applied to potential energy curves computed by an anion-centered asymptotic model. The analyticity of both models allows getting a deeper insight into the reaction. It allows defining a low collision energy regime for the mutual neutralization at which the collision energy no longer affects the branching ratios. Using those models, we explain how heavier isotopes favor the production of higher excited states.

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Observation of an isotope effect in state-selective mutual neutralization of lithium with hydrogen

Alice F. Schmidt-May, Stefan Rosén, MingChao Ji, Gustav Eklund, Henning Zettergren, Henrik Cederquist, Henning T. Schmidt, Paul S. Barklem, and Jon Grumer
Phys. Rev. A 108, 042810 (2023)

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Outline

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Phys. Rev. A 108, 042809– Published 16 October, 2023
  • Received 2 June 2023
  • Accepted 18 September 2023
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