Regensburg 2010 – wissenschaftliches Programm

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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

Mittwoch, 24. März 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 Moseler^2,3,4, and Heinz Hövel¹ — ¹TU Dortmund, Experimentelle Physik I — ²Universität Freiburg, Fakultät für Physik — ³Fraunhofer Institut für Werkstoffmechanik, Freiburg — ⁴Freiburger Materialforschungszentrum

Mass selected clusters from Ag₅₅⁺ to Ag_138±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, Ag_138±2⁺ is larger and corresponds to the height of the closed shell icosahedral cluster Ag_147±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.