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Cationic Complexes of Hydrogen with Helium
Author(s) -
Bartl Peter,
Leidlmair Christian,
Denifl Stephan,
Scheier Paul,
Echt Olof
Publication year - 2013
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201200664
Subject(s) - helium , ion , chemistry , hydrogen , deuterium , mass spectrum , cluster (spacecraft) , mass spectrometry , diatomic molecule , molecule , atomic physics , analytical chemistry (journal) , physics , organic chemistry , chromatography , computer science , programming language
High‐resolution mass spectra of helium nanodroplets doped with hydrogen or deuterium reveal that copious amounts of helium can be bound to H + , H 2 + , H 3 + , and larger hydrogen‐cluster ions. All conceivable He n H x + 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 He n H x + for x =1, 2, or 3, and n ≤30 reveal particularly stable cluster ions. Our results for He n H 1 + are consistent with conclusions drawn from previous experimental and theoretical studies which were limited to smaller cluster ions. The He n H 3 + 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. H 2 + ) retains helium with much greater efficiency than hydrogen‐cluster ions.