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Formation of HDO, OH−, and OD− in low-energy O−+ HD collisions

Jiří Táborský, Martin Čížek2,*, and Karel Houfek2

Štěpán Roučka, Daniel Rednyk, Octavio Emmanuel Hernández Alvarez, Thuy Dung Tran, Artem Kovalenko, Petr Dohnal, Radek Plašil, and Juraj Glosík

  • Faculty of Mathematics and Physics, Charles University, Institute of Theoretical Physics, V Holešovičkách 2, 18000 Prague, Czech Republic

  • Faculty of Mathematics and Physics, Charles University, Department of Surface and Plasma Science, V Holešovičkách 2, 18000 Prague, Czech Republic

  • *Contact author: Martin.Cizek@mff.cuni.cz
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Phys. Rev. A 113, 042807 – Published 8 April, 2026

DOI: https://doi.org/10.1103/jwhb-rlkj

Abstract

This paper presents a combined theoretical and experimental study of the collisions between oxygen anions (O−) and HD molecules. The thermal rate coefficients for associative electron detachment (HDO molecule formation), hydrogen transfer (OH− ion formation), and deuterium transfer (OD− ion formation) were measured at temperatures between 10 and 200 K in a radio-frequency ion trap. The experimental data are compared with theoretical reaction rate coefficients, which were computed over a temperature range of 10–4000 K using the classical-trajectory Monte Carlo method on an ab initio calculated potential energy surface. The thermal rate coefficients for reactions with other deuterated or tritiated variants of the H2 molecule were also calculated. We analyze the results in terms of cross sections and the dependence of reaction and detachment probabilities on the impact parameter. Additionally, we demonstrate that the scattering dynamics for this system exhibits signatures of deterministic chaos at the classical level.

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Phys. Rev. A 113, 042807– Published 8 April, 2026
  • Received 28 October 2025
  • Accepted 25 February 2026
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