Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)

O 27.42: Poster

Dienstag, 24. März 2009, 18:30–21:00, P2

Investigation of the adsorption of CO and simple alcohols on the Rutile(110) surface with He atom scattering and spectroscopic methods — •David Silber¹, Martin Kunat¹, Franziska Traeger¹, Hengshan Qui¹, Yuemin Wang¹, Christof Wöll¹, Piotr Kowalski¹, Bernd Meyer², and Christof Hättig¹ — ¹Lehrstuhl für Physikalische Chemie I, Lehrstuhl für Theoretische Chemie an der RUB, Bochum — ²Interdisziplinäres Zentrum für Molekulare Materialien (ICMM), Erlangen

We have studied the adsorption of CO on the rutile TiO2 (110) surface. He-atom angular distributions were recorded to characterize the ordering of adsorbed CO and revealed a (1x1) diffraction pattern along both high-symmetry directions. Surprisingly, the width of the diffraction peaks was strongly different also the two high-symmetry directions. We explain this anomaly by the presence of a structure containin grows of CO-molecules tilted in an alterante fashion, yielding either a (2x1) or a (2x2) superstructure. Both structures exhibit glide planes, leading to peak extinctions along both high symmetry directions. The binding energy of the CO molecule to the surface as determined by using He-TDS and conventional TDS amounts to 8.0 kcal/mol. We also report first results about overlayer structures observed for different alcohols and their binding energies on the same substrates. For methanol and ethanol we provide evidence that the interaction with the surface leads to deprotonation. Data from near edge x-ray absorption spectroscopy supports this conclusion.