Structures of Neutral Au 7 , Au 19 , and Au 20 Clusters in the Gas Phase

American Association for the Advancement of Science (AAAS) - Tập 321 Số 5889 - Trang 674-676 - 2008
Philipp Gruene1,2,3, D. M. Rayner1,2,3, Britta Redlich4,1,3, A. F. G. van der Meer4,1,3, Jonathan T. Lyon1,2,3, Gerard Meijer1,2,3, André Fielicke1,2,3
1Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany
2Steacie Institute for Molecular Sciences, Ottawa, Ontario K1A 0R6, Canada.
3Stichting voor Fundamenteel Onderzoek der Materie (FOM) Institute for Plasma Physics Rijnhuizen, 3439 MN Nieuwegein, Netherlands.
4FOM Institute for Plasma Physics Rijnhuizen, 3439 MN Nieuwegein, The Netherlands

Tóm tắt

The catalytic properties of gold nanoparticles are determined by their electronic and geometric structures. We revealed the geometries of several small neutral gold clusters in the gas phase by using vibrational spectroscopy between 47 and 220 wavenumbers. A two-dimensional structure for neutral Au 7 and a pyramidal structure for neutral Au 20 can be unambiguously assigned. The reduction of the symmetry when a corner atom is cut from the tetrahedral Au 20 cluster is directly reflected in the vibrational spectrum of Au 19 .

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The authors acknowledge support from the Cluster of Excellence Unifying Concepts in Catalysis coordinated by the Technische Universität Berlin and funded by the Deutsche Forschungsgemeinschaft. This work is supported by FOM by providing beam time for FELIX. We thank the FELIX staff for their skillful assistance in particular J. Pluijgers and R. van Buuren as well as K. Rademann for providing the cluster source. P.G. thanks the International Max Planck Research School Complex Surfaces in Material Science and J.T.L. thanks the Alexander von Humboldt Foundation for funding.

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American Association for the Advancement of Science (AAAS)

Tập 321 Số 5889

674-676

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