Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 23: Nanostructures at surfaces: Dots, particles, clusters
O 23.7: Vortrag
Dienstag, 23. März 2010, 12:00–12:15, H33
Spectroscopy of Mass Selected Clusters — •Niklas Grönhagen1, Ben Wortmann1, Kolja Mende1, Natalie Miroslawski1, Stefanie Duffe1, Bernd von Issendorff2, Michael Moseler2,3,4, and Heinz Hövel1 — 1TU Dortmund, Experimentelle Physik I — 2Universität Freiburg, Fakultät für Physik — 3Fraunhofer Institut für Werkstoffmechanik, Freiburg — 4Freiburger Materialforschungszentrum
We deposited mass selected Ag clusters on C60 films at low temperatures. Their size ranged from Ag55+ to Ag923±9+ which correspond to closed shell icosahedra and in STM images they were found to stay size selected after the soft landing process. We investigated the electronic properties with ultraviolet photoemission spectroscopy (UPS). Because the dominant signal of C60 masks the signal of the clusters, for UPS experiments HOPG was used as a substrate instead. Coalescence was avoided by depositing and measuring at 40 K, which reduces the mobility of the clusters. For these samples we could detect the Ag UPS signal. In further analysis we measured the size of the deposition spot using the spatial distribution of the energy integrated UPS cluster signal.
In addition we investigated clusters on 1 ML C60/Au(111), which ranged from Ag55 to Ag138±1 by using STS and compared them to previous STS measurements of Ag clusters on C60/HOPG.