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O: Oberflächenphysik

O 14: Postersitzung (Adsorption an Oberflächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Phasenübergänge, Rastersondentechniken, Struktur und Dynamik reiner Oberflächen)

O 14.4: Poster

Montag, 8. März 2004, 18:00–21:00, Bereich C

Far Infrared study of ultrathin metal films on MgO — •A. Priebe, G. Fahsold, M. Lust, O. Skibbe, and A. Pucci — Kirchhoff-Institut für Physik, Universität Heidelberg,

With far infrared spectroscopy it is possible to determine the dynamic conductivity of ultrathin metal films and their change due to adsorbates. Metal deposition strongly changed the reflectivity at the TO phonon frequency of MgO. This effect leads to an enhanced sensitivity with respect to the metal film charge carriers. Exposure of CO lead to further spectral changes which are clearly visible at the TO frequency of MgO, too. From the spectral structures we calculate adsorbate induced changes of the relaxation rate of the free charge carriers in the metal. Also, we discuss the influence of the polarization and of the incident angle of the infrared beam on this spectral feature.