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Title: The adsorption of helium atoms on coronene cations
Authors: Kurzthaler, Thomas
Rasul, Bilal
Kuhn, Martin
Lindinger, Albrecht
Scheier, Paul
Ellis, Andrew M.
First Published: 10-Aug-2016
Publisher: AIP Publishing
Citation: Journal of Chemical Physics, 2016, 145 (6), 064305
Abstract: We report the first experimental study of the attachment of multiple foreign atoms to a cationic polycyclic aromatic hydrocarbon (PAH). The chosen PAH was coronene, C24H12, which was added to liquid helium nanodroplets and then subjected to electron bombardment. Using mass spectrometry, coronene cations decorated with helium atoms were clearly seen and the spectrum shows peaks with anomalously high intensities (“magic number” peaks), which represent ion-helium complexes with added stability. The data suggest the formation of a rigid helium layer consisting of 38 helium atoms that completely cover both faces of the coronene ion. Additional magic numbers can be seen for the further addition of 3 and 6 helium atoms, which are thought to attach to the edge of the coronene. The observation of magic numbers for the addition of 38 and 44 helium atoms is in good agreement with a recent path integral Monte Carlo prediction for helium atoms on neutral coronene. An understanding of how atoms and molecules attach to PAH ions is important for a number of reasons including the potential role such complexes might play in the chemistry of the interstellar medium.
DOI Link: 10.1063/1.4960611
ISSN: 0021-9606
eISSN: 1089-7690
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2016 AIP Publishing. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Chemistry

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