Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)

O 41.54: Poster

Tuesday, March 23, 2010, 18:30–21:00, Poster B1

Interaction of propene with an oxygen-precovered Au(110)*(1x2) surface — •Inga Spreine and Klaus Christmann — Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany

We have studied the interaction of propene with the (1x2)-reconstructed Au(110) surface covered with well-defined amounts of reactive atomic oxygen species by means of thermal reaction mass spectrometry. The chemisorbed O atoms were obtained by electron-bombarding an equilibrium coverage of physisorbed oxygen molecules at T=35 K and p(O₂)=2· 10⁻⁸ mbar. The presence and amount of reactive O was monitored and controlled by the well-known TD states appearing between 450 and 550 K [1]. After dosing defined amounts of propene at T=90 K we looked for possible partial and total oxidation products and their fragments. Desorption of the total oxidation products CO₂ (m/z 44) and H₂O (m/z 18) occurs between 170 and 520 K and represent the majority of the reaction products. Nevertheless, we were able to also detect minor amounts of partial oxidation products like propene oxide (m/z 58 and 31) and acrolein (m/z 55 and 56). The formation of acrylic acid (m/z 72) and acetone (m/z 43), however, could not be observed. Our results are discussed and compared with similar previous investigations on the Au(111) [2] and the Au(100) and Au(111) surfaces [3].

[1] M. Gottfried et al., Surf. Sci. 511 (2002) 65 [2] X. Deng et al., J. Phys. Chem. B 110 (2006) 15982 [3] K.A. Davis and D.W. Goodman, J. Phys. Chem. B 104 (2000) 8557