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Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)

O 59.3: Poster

Wednesday, March 24, 2010, 17:45–20:30, Poster B1

The height of size selected Ag clusters on C60 films — •Natalie Miroslawski1, Niklas Grönhagen1, Kolja Mende1, Stefanie Duffe1, Bernd von Issendorff2, Michael Moseler2,3,4, and Heinz Hövel11TU Dortmund, Experimentelle Physik I — 2Universität Freiburg, Fakultät für Physik — 3Fraunhofer Institut für Werkstoffmechanik, Freiburg — 4Freiburger Materialforschungszentrum

Mass selected clusters from Ag55+ to Ag138±2+ were soft landed at 77 K on C60/Au(111) and imaged with STM at 77 K. We observed extremely narrow cluster height distributions. The cluster heights are constant up to Ag80+ which can be explained assuming an icosahedrical shape for Ag55+ and the formation of caps of silver atoms at the rim of the clusters for larger sizes. A remarkable change in height occurs between Ag80+ and Ag88+ clusters. An additional monolayer formed at the top cluster facet might be responsible. Ag88+ and Ag95+ have the same height, Ag138±2+ is larger and corresponds to the height of the closed shell icosahedral cluster Ag147±2+. It was possible to deposit different cluster masses onto one sample. Although the deposition spots were deposited in close proximity, we were able to separate them clearly. Experiments with scanning tunnelling spectroscopy (STS) at 5 K hint to notable differences between our measurements on C60/Au(111) and previous measurements on C60/HOPG.

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