Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Organic-Inorganic Hybrid Systems and Organic Films IV

O 29.3: Vortrag

Dienstag, 21. März 2017, 11:00–11:15, WIL A317

A novel facility for time- and space-resolved molecular dynamics on surfaces — •Bernhard Huber1, Sebastian Pres1, Emanuel Wittmann2, Lysanne Dietrich1, Julian Lüttig1, Victor Lisinetskii1, Matthias Hensen1, Eberhard Riedle2, and Tobias Brixner11Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität München, Oettingenstraße 67, 80538 München, Germany

How do energy transport processes between individual molecules or inside large heterogeneous structures like light harvesting complexes occur? Is the transport dominated by step-by-step hopping of excitation or do the individual molecules form a strongly coupled system in which the excitation is delocalized over all constituents? How are these transport phenomena influenced by interactions with the substrate, the environment and external light sources? To investigate these questions the measurement signal of the prepared system has to be retrieved with high temporal (femtosecond regime) and spatial resolution far below the optical diffraction limit (several nanometers). The surface spectroscopy facility presented here combines aberration-corrected photoemission electron microscopy (AC-PEEM) with a widely tunable femtosecond laser system down to the UV range rendered by optical parametric amplification. Thus, the surface dynamics can be explored in a time-interferometric scanning scheme with high spectral addressability of sample specific resonances. Here we demonstrate first results of spectrally selective photoemission microscopy.

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