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Atomic Gold Ions Clustered with Noble Gases: Helium, Neon, Argon, Krypton, and Xenon
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Number of Authors: 72019 (English)In: Journal of Physical Chemistry A, ISSN 1089-5639, E-ISSN 1520-5215, Vol. 123, no 44, p. 9505-9513Article in journal (Refereed) Published
Abstract [en]

High-resolution mass spectra of helium droplets doped with gold and ionized by electrons reveal HenAu+ cluster ions. Additional doping with heavy noble gases results in NenAu+, ArnAu+, KrnAu+, and XenAu+ cluster ions. The high stability predicted for covalently bonded Ar2Au+, Kr2Au+, and Xe2Au+ is reflected in their relatively high abundance. Surprisingly, the abundance of Ne2Au+, which is predicted to have zero covalent bonding character and no enhanced stability, features a local maximum, too. The predicted size and structure of complete solvation shells surrounding ions with essentially nondirectional bonding depends primarily on the ratio sigma* of the ion-ligand versus the ligand-ligand distance. For Au+ solvated in helium and neon, the ratio sigma* is slightly below 1, favoring icosahedral packing in agreement with a maximum observed in the corresponding abundance distributions at n = 12. HenAu+ appears to adopt two additional solvation shells of I-h symmetry, containing 20 and 12 atoms, respectively. For ArnAu+, with sigma* approximate to 0.67, one would expect a solvation shell of octahedral symmetry, in agreement with an enhanced ion abundance at n = 6. Another anomaly in the ion abundance at Ar9Au+ matches a local maximum in its computed dissociation energy.

Place, publisher, year, edition, pages
2019. Vol. 123, no 44, p. 9505-9513
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Chemical Sciences Physical Sciences
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URN: urn:nbn:se:su:diva-176548DOI: 10.1021/acs.jpca.9b06715ISI: 000495771700008PubMedID: 31621319OAI: oai:DiVA.org:su-176548DiVA, id: diva2:1380026
Available from: 2019-12-18 Created: 2019-12-18 Last updated: 2019-12-18Bibliographically approved

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Martini, PaulKranabetter, LorenzGatchell, MichaelScheier, PaulEcht, Olof
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