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Frankfurt 2006 – wissenschaftliches Programm

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MO: Molekülphysik

MO 13: Molecular Clusters I

MO 13.4: Vortrag

Montag, 13. März 2006, 14:45–15:00, H10

Gas Phase Vibrational Spectroscopy of Bimetallic Oxide Cluster Anions — •E. Janssens1,2, G. Santambrogio1, M. Brümmer1, L. Wöste1, P. Lievens2, J. Sauer3, G. Meijer4, and K.R. Asmis41Institut für Experimentalphysik, F.U. Berlin, Arnimallee 14, 14195 Berlin — 2Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U. Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium — 3Institut für Chemie, H.U. Berlin, Unter den Linden 6, 10099 Berlin — 4Fritz-Haber Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin

Transition metal oxides on oxide surfaces play a central role in heterogeneous catalysis. However because of the complex interactions between the active sites and the support, the catalytic mechanisms are not completely known. Molecular beam studies on mass-selected particles under well controlled conditions can aid to understand these interesting systems. Here, we present the first systematic infrared study of bimetallic oxide clusters in the gas phase.
Mixed VnTimOp clusters are studied with IR multiphoton dissociation spectroscopy in the 500 to 1200 cm−1 range and assigned on the basis of harmonic frequencies calculated with DFT. The clusters are produced in a dual laser vaporization source, stored in an ion trap, and irradiated with IR light of a free electron laser. The closed shell (V2O5)n−1(VTiO5) (n=2−4) clusters are shown to form caged structures similar to their isoelectronic monometallic counterparts, the neutral vanadium oxide clusters (V2O5)n (n=2−4). Titanium-richer anions, V4−nTinO10 (n=1−4), prefer to maintain the tetrahedral shape of V4O10 rather than pairing electrons, leading to a quartet ground state in Ti4O10.

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