Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 37: Poster II: Focused electron beam induced processing for the fabrication of nanostructures (focused session, jointly with O); Nanoengineered thin films; Layer properties: electrical, optical, and mechanical properties; Thin film characterization: structure analysis and composition (XRD, TEM, XPS, SIMS, RBS,..); Application of thin films

DS 37.12: Poster

Donnerstag, 29. März 2012, 15:00–17:00, Poster E

IR spectroscopic studies on the influence of Fe and Mg on the Si-O stretching vibration in Fe/Mg-Si-O systems — •Martin Wunder, Steffen Wetzel, and Annemarie Pucci — Kirchhoff-Institut für Physik, INF 227, 69121 Heidelberg

Fe-Mg silicates are among the most abundant minerals in space. Their IR spectral features strongly depend on the chemical composition and formation conditions. Therefore a thorough spectral analysis of the 10 µm feature can reveal important information on the dust formation processes. Interfacial interaction effects are generally neglected in such analysis. In order to deepen the understanding of the origin of IR spectral changes, we performed in situ IR spectroscopic transmission measurements during the condensation of layers produced by evaporation of Fe, Mg and SiO under UHV conditions. Particularly we addressed the influence of elemental metal on the 10 µm feature of silicates in our experiments. Details of the experimental setup and results from the measurements on multilayer structures and layers formed by co-evaporation will be presented. These measurements demonstrate a strong Fano-type interaction between the metal particles and the Si-O vibration. Furthermore a strong shift of the resonance frequency is observed for co-evaporation experiments.