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Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 27: Poster: Cluster

MO 27.1: Poster

Donnerstag, 11. März 2010, 16:00–18:30, Lichthof

Structural investigation of platinum and ruthenium cluster cations — •Christian Kerpal1, Daniel Harding1, Yunjie Xu2, André Fielicke1, and Gerard Meijer11Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany — 2Univeristy of Alberta, Edmonton, Alberta, Canada

Small clusters of both platinum and ruthenium represent models for potentially important industrial catalysts. In the case of ruthenium the catalytic abilities include, for example, its low temperature activity in ammonia synthesis, whereas for platinum, its role in the activation of C-H bonds and its potential usage in fuel cells have been of great interest. The long term goal of such cluster model studies is to understand the chemistry occurring at specific low coordinated metal sites in heterogeneous catalysis. However, the properties of metal clusters often differ dramatically with particle size and as most of the physical and chemical properties of clusters are directly related to their geometries the determination of the precise structure is essential. Structural information can be obtained via infrared multiple photon dissociation of metal-cluster-argon complexes in the range of the clusters’ vibrational fundamentals. This yields the cluster-size specific far-IR spectra. Here we present the far-IR spectra of platinum and ruthenium cluster cations containing up to 10 metal atoms in the 130-320 cm−1 range. By comparison with quantum chemical calculations the clusters structures can be deduced. This also provides a benchmark for the challenging calculations allowing their further improvement.

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