Berlin 2005 – wissenschaftliches Programm
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MS: Massenspektrometrie
MS 3: Cluster und Aerosole
MS 3.2: Vortrag
Freitag, 4. März 2005, 14:30–14:45, HU 3088
Gold cluster carbonyls: Saturated adsorption of CO on gold clusters, vibrational spectroscopy and implications for the cluster structures — •André Fielicke1, Gert von Helden1, Gerard Meijer1, David P. Pedersen2, Benoit Simard2, and David M. Rayner2 — 1Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin — 2Steacie Institute for Molecular Sciences, NRC, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada
We report on the interaction of carbon monoxide, CO, with cationic and anionic gold clusters in the gas phase. Successive adsorption of CO molecules on the gold clusters proceeds until a cluster size specific saturation coverage is reached. Structural information for the bare gold clusters is obtained by comparing the saturation composition with the number of available equivalent sites presented by candidate structures. By inference we also establish the structure of the saturated Aun(CO)m complexes. In certain cases we find evidence suggesting that successive adsorption of CO can distort the metal cluster framework. We measure the vibrational spectra of the Aun(CO)m complexes in both the CO stretching region and in the region of the Au-C stretch and the Au-C-O bend using infrared multiple photon dissociation spectroscopy. The vibrational spectra further aid in the Aun structure determination, provide information on the structure of the CO complexes and allow comparison with CO adsorbates on deposited clusters or surfaces.