The adsorption of helium atoms on small cationic gold clusters

Adducts formed between small gold cluster cations and helium atoms are reported for the first time. These binary ions, Aun+Hem, were produced by electron ionization of helium nanodroplets doped with neutral gold clusters and were detected using mass spectrometry. For a given value of n, the distribution of ions as a function of the number of added helium atoms, m, has been recorded. Peaks with anomalously high intensities, corresponding to so-called magic number ions, are identified and interpreted in terms of the geometric structures of the underlying Au-n(+) ions. These features can be accounted for by planar structures for Au-n(+) ions with n <= 7, with the addition of helium having no significant effect on the structures of the underlying gold cluster ions. According to ion mobility studies and some theoretical predictions, a 3-D structure is expected for Au-8(+). However, the findings for Au-8(+) in this work are more consistent with a planar structure.

Gatchell, MichaelStockholms universitet,Fysikum,Universität Innsbruck, Austria(Swepub:su)miga8512 (författare)
Kranabetter, Lorenz (författare)
Kuhn, Martin (författare)
Martini, Paul (författare)
Gitzl, Norbert (författare)
Rainer, Manuel (författare)
Postler, Johannes (författare)
Scheier, Paul (författare)
Ellis, Andrew M. (författare)
Stockholms universitetFysikum (creator_code:org_t)

Ingår i:Physical Chemistry, Chemical Physics - PCCP: Royal Society of Chemistry (RSC)20:14, s. 9554-95601463-90761463-9084

Av författaren/redakt...: Goulart, Marcelo; Gatchell, Michae ...; Kranabetter, Lor ...; Kuhn, Martin; Martini, Paul; Gitzl, Norbert; visa fler...; Rainer, Manuel; Postler, Johanne ...; Scheier, Paul; Ellis, Andrew M.; visa färre...

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