Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 62: Posters: Surface Reactions and Dynamics, Nanostructures
O 62.23: Poster
Mittwoch, 2. April 2014, 17:30–21:00, P1
Optical measurements and simulations for cluster plasmons in various environments — •David Odenthal, David Engemann, and Heinz Hövel — Fakultät Physik/DELTA, Technische Universität Dortmund, 44227 Dortmund
The research on clusters, consisting from a few up to some hundreds silver atoms, shall shed light on their behaviour compared to a solid-state body or a single atom. Depositioning clusters into various environments is necessary to apply their special properties, for instance their reactivity in catalysis.
To investigate the properties of clusters on surfaces, various amounts of clusters were deposited into silica aerogel (chem. SiO2). Aerogel is a highly porous compound which contains mainly air (up to 99 vol.- %) and it is highly transparent for the wavelengths used in the experiments. The samples were irradiated with light ranging from ultraviolet to visible, so that cluster plasmons[1] were excited and the extinction spectrum was recorded. The results were then compared with theoretical models, so that physical variables like the thickness of a surrounding shell could be determined.
U. Kreibig and M. Vollmer. Optical Properties of Metal Clusters. Springer-Verlag Berlin Heidelberg, 1995.