• Open Access

Cationic Complexes of Hydrogen with Helium

Authors

  • Peter Bartl,

    1. Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck (Austria), Fax: (+43) 512 507 2932
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  • Dr. Christian Leidlmair,

    1. Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck (Austria), Fax: (+43) 512 507 2932
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  • Dr. Stephan Denifl,

    1. Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck (Austria), Fax: (+43) 512 507 2932
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  • Prof. Dr. Paul Scheier,

    Corresponding author
    1. Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck (Austria), Fax: (+43) 512 507 2932
    • Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck (Austria), Fax: (+43) 512 507 2932
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  • Prof. Dr. Olof Echt

    Corresponding author
    1. Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck (Austria), Fax: (+43) 512 507 2932
    2. Department of Physics, University of New Hampshire, Durham, NH 03824 (USA)
    • Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck (Austria), Fax: (+43) 512 507 2932
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Abstract

High-resolution mass spectra of helium nanodroplets doped with hydrogen or deuterium reveal that copious amounts of helium can be bound to H+, H2+, H3+, and larger hydrogen-cluster ions. All conceivable HenHx+ stoichiometries are identified if their mass is below the limit of ≈120 u set by the resolution of the spectrometer. Anomalies in the ion yields of HenHx+ for x=1, 2, or 3, and n≤30 reveal particularly stable cluster ions. Our results for HenH1+ are consistent with conclusions drawn from previous experimental and theoretical studies which were limited to smaller cluster ions. The HenH3+ series exhibits a pronounced anomaly at n=12 which was outside the reliable range of earlier experiments. Contrary to findings reported for other diatomic dopant molecules, the monomer ion (i.e. H2+) retains helium with much greater efficiency than hydrogen-cluster ions.

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