Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 14: Poster 1: Cluster, Femtosecond Spectroscopy

MO 14.27: Poster

Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof

Linear and nonlinear spectroscopy of size selected silver clusters on surfaces — •Martin Tschurl, Philipp Heister, Tobias Lünskens, and Ueli Heiz — Technische Universität München, Lehrstuhl für physikalische Chemie

It has been shown that the catalytic activity of small metal clusters vary by orders of magnitude upon addition of a single metal atom. Through a precise knowledge of the electronic structure and geometry from spectroscopic studies a better understanding of the interplay between the electronic and geometrical structure and the catalytic activity of the clusters may be gained. Therefore we use different spectroscopic methods to investigate size selected metal clusters on surfaces under UHV conditions. Highly sensitive techniques such as surface Cavity Ring-Down spectroscopy (s-CRD) and surface Second-Harmonic-Generation spectroscopy (s-SHG) are applied for obtaining the optical properties of the clusters. This study mainly focuses on the size and shape dependent electronic structures and plasmon-like transitions of small deposited Ag-clusters. By monitoring these plasmon oscillations further information about oxidation and reduction of the supported size selected clusters can be obtained. In addition, cluster-plasmon size effects are studied and a behavior of their optical properties with their geometric structure is observed.