Dresden 2009 – scientific programme
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.74: Poster
Wednesday, March 25, 2009, 17:45–20:30, P2
Interaction of Fe and Fe2O3 with reactive gases — •Kai Tristan Volgmann, Florian Voigts, and Wolfgang Maus-Friedrichs — Institut für Physik und Physikalische Technologien, TU Clausthal, Leibnizstr. 4, 38678 Clausthal-Zellerfeld
Mars’ atmosphere contains a rather high portion of methane and formaldehyde with 10 ppb respectively 100 ppb. Different sources including extraterrestial life have been proposed, but the origin of these gases is still unknown. It has been found earlier that methane and formaldehyde can be produced through a photocatalytical process on a hematite surface with adsorbed water in a CO2 atmosphere.
The scope of this work is to examine the underlying processes which happen on granular powders of hematite. As a first step thin films of iron and Fe2O3 are examined.
These thin films are investigated by means of their interaction with reactive gases like O2, CO2 and H2O. These reactions have been studied with photoelectron spectroscopy. X-ray photoelectron spectroscopy is used to determine stoichiometry of the samples, while Ultraviolet photoelectron spectroscopy and Metastable Induced Electron Spectrocopy are used to analyse the valence band region and to gain information about changes in workfunction due to reactions on the surfaces.