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Dresden 2009 – scientific programme

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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 27.63: Poster

Tuesday, March 24, 2009, 18:30–21:00, P2

A spectroscopy study of water adsorption on diamond surfaces — •Simon Quartus Lud1, Dominique Verreault2, Patrick Koelsch2, Martin Huth3, Bert Nickel3, Hendrik Bluhm4, John Newberg4, Martin Stutzmann1, and Jose Antonio Garrido11Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, 85748 Garching, Germany — 2Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany — 3Department für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany — 4Chemical Sciences Division, Lawrence Berkeley National Laboratories, Berkeley, CA 94720, USA

We have explored the adsorption of water layers onto different diamond surfaces at the solid-gas interface. X-ray reflectivity (XRR), sum frequency generation (SFG) spectroscopy and X-ray photoelectron spectroscopy (XPS) have been used to investigate the adsorbed water onto the diamond films under controlled humidity. XRR reveals the presence of a water film on the hydrophilic O-terminated surfaces, with a thickness increasing with humidity. Interestingly, even if highly hydrophobic, the hydrogenated surface also shows a humidity-dependent water film. SFG spectroscopy, with its high surface sensitivity, revealed different vibrational modes of interfacial water, including the so-called free OH stretching mode at 3700 cm−1. Temperature dependent SFG experiments were performed to investigate the stability of the water films on H-, F- and O-terminated surfaces, unveiling a surprisingly high stability for water even on the hydrophobic surfaces.

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