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O: Oberflächenphysik

O 26: Adsorption an Oberflächen II

O 26.6: Vortrag

Dienstag, 9. März 2004, 17:00–17:15, H45

Surface plasmons of metal islands and their influence on the infrared absorption of adsorbates — •A. Priebe, G. Fahsold, and A. Pucci — Kirchhoff-Institut für Physik, Universität Heidelberg,

The surface enhanced infrared absorption (SEIRA) of adsorbates on nano-structured metal films are widely used in chemistry and biology. For the first monolayer the typical asymmetric SEIRA line shape can be explained by an interaction of the adsorbate with electron-hole pairs of the metal film. But asymmetric SEIRA lines are observed also for vibrations in multilayers. From experimental results it is known that the asymmetry and the enhancement of SEIRA lines show a strong dependency on the filling factor of the metal in the island film. In this work we show how both, the asymmetry and the enhancement could be explained with respect to their change with filling factor. Experimental SEIRA spectra from adsorbates on nanoparticle arrays with ordered facets can be described by a theory that only considers the interaction of adsorbate vibrations with surface plasmons of the metal film.

A. Priebe, M. Sinther, G. Fahsold, and A. Pucci J. Chem. Phys. 119 (2003), 4887