Cationic Complexes of Hydrogen with Helium. Issue 1 (22nd October 2012)

• Record Type: Journal Article
• Authors: Bartl, Peter; Leidlmair, Christian; Denifl, Stephan; Scheier, Paul; Echt, Olof
• Is Part Of: Chemphyschem. Volume 14:Issue 1(2013)
• Page Start: 227
• Page End: 232
• Publication Date: 2012-10-22
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.201200664
• Languages: English
• ISSNs: 1439-4235

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>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 He_{<italic>n</italic>}H_{<italic>x</italic>}⁺ 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_{<italic>n</italic>}H_{<italic>x</italic>}⁺ for <italic>x</italic>=1, 2, or 3, and <italic>n</italic>≤30 reveal particularly stable cluster ions. Our results for He_{<italic>n</italic>}H₁⁺ are consistent with conclusions drawn from previous experimental and theoretical studies which were limited to smaller cluster ions. The He_{<italic>n</italic>}H₃⁺ series exhibits a pronounced anomaly at <italic>n</italic>=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.</p> </abstract>