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Volume 195, 2016
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Atom tunnelling in the reaction NH3+ + H2 → NH4+ + H and its astrochemical relevance

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Abstract

The title reaction is involved in the formation of ammonia in the interstellar medium. We have calculated thermal rates including atom tunnelling using different rate theories. Canonical variational theory with microcanonically optimised multidimensional tunnelling was used for bimolecular rates, modelling the gas-phase reaction and also a surface-catalysed reaction of the Eley–Rideal type. Instanton theory provided unimolecular rates, which model the Langmuir–Hinshelwood type surface reaction. The potential energy was calculated on the CCSD(T)-F12 level of theory on the fly. We report thermal rates and H/D kinetic isotope effects. The latter have implications for observed H/D fractionation in molecular clouds. Tunnelling causes rate constants to be sufficient for the reaction to play a role in interstellar chemistry even at cryogenic temperature. We also discuss intricacies and limitations of the different tunnelling approximations to treat this reaction, including its pre-reactive minimum.

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Publication details

The article was received on 27 Apr 2016, accepted on 31 May 2016 and first published on 31 May 2016


Article type: Paper
DOI: 10.1039/C6FD00096G
Citation: Faraday Discuss., 2016,195, 69-80
  • Open access: Creative Commons BY license
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    Atom tunnelling in the reaction NH3+ + H2 → NH4+ + H and its astrochemical relevance

    S. Álvarez-Barcia, M. Russ, J. Meisner and J. Kästner, Faraday Discuss., 2016, 195, 69
    DOI: 10.1039/C6FD00096G

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