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O: Fachverband Oberflächenphysik
O 75: Particles and clusters
O 75.5: Vortrag
Donnerstag, 29. März 2012, 17:00–17:15, MA 041
Ultraviolet photoelectron spectroscopy of mass selected metal clusters on graphite (HOPG) — •Natalie Miroslawski1, David Engemann1, Niklas Grönhagen1, Bernd von Issendorff2, and Heinz Hövel1 — 1Experimentelle Physik I, Technische Universität Dortmund, Germany — 2Fakultät für Physik, Universität Freiburg, Germany
Mass selected silver and copper clusters between 34 and 923 atoms were deposited with less then 0.1eV/atom kinetic energy on graphite (HOPG) and investigated with ultraviolet photoelectron spectroscopy (UPS) with a photon energy of 21.2eV. The clusters were deposited with different coverage for each cluster size and measured at 125K. For a better interpretation we subtracted normalized HOPG spectra from the measured cluster spectra to extract the d-band structure of the clusters. To investigate the cluster mobility and coalescence we varied the deposition temperature and the cluster coverage. Additionally we annealed the sample after deposition at different temperatures and observed changes in the UPS spectra depending on the cluster coverage.