Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)
O 18.76: Poster
Montag, 25. Februar 2008, 18:30–19:30, Poster F
Study of supported metal Clusters and nano Dots with time and energy resolved PEEM — •Martin Rohmer1, Christian Schneider1, Michael Bauer2, Heinz Hövel3, Farhad Ghaleh3, and Martin Aeschlimann1 — 1Technische Universität Kaiserslautern, 67663 Kaiserslautern — 2Institut für Experimentelle und Angewandte Physik, Universität Kiel, 24118 Kiel — 3Experimentelle Physik I, Universität Dortmund, 44221 Dortmund
The ultrafast dynamics associated with collective (plasmon) excitations as well as single electron excitations in supported clusters is addressed with high lateral resolution by means of the time- and energy resolved two-photon Photoemission Electron Microscopy (TR-2PPEEM). Experiments performed at different cluster and nanostructured systems show that this setup is capable to map even very small particle to particle variations in the hot electron lifetime of the order of a few femtoseconds [1]. The high temporal sensitivity of time-resolved PEEM to these inhomogenities arises from the parallel data acquisition mode intrinsic to this technique. It significantly reduces the resolution limiting influence of systematic error arising from temporal fluctuations in the experimental parameters. Here we report about the potential and our progress in measuring electron live times in silver clusters and nano dots.
[1] Mapping the femtosecond dynamics of supported clusters with nanometer resolution, M. Rohmer, F. Ghaleh, M. Aeschlimann, M. Bauer, H. Hövel; Eur. Phys. J. D, Online First