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Regensburg 2000 – scientific programme

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O: Oberflächenphysik

O 11: Postersession (Eröffnung)

O 11.34: Poster

Monday, March 27, 2000, 19:00–22:00, Bereich C

Water adsorption on TiO2: Investigations with MIES, UPS and TPD — •Stefan Krischok1,2, Jens Günster1,3, Jeffrey Stultz1 und D. Wayne Goodman11Department of Chemistry Texas A& M University, College Station, Texas, 77843-3255, USA — 2permanent address: Physikalisches Institut, TU Clausthal, Leibnizstraße 4, 38678 Clausthal-Zellerfeld, Germany — 3permanent address: Institut für Nichtmetallische Werkstoffe, TU Clausthal, Zehntnerstraße 2A, 38678 Clausthal-Zellerfeld, Germany

TiO2 films grown on a Mo(100) substrate were exposed to water while metastable impact electron (MIES) and UPS(HeI) spectra were collected in situ. An unambiguous identification of the spectral features from OH and H2O species was possible by MIES. Additionally, TPD experiments were carried out in order to get information about desorption temperature and saturation coverage for different temperatures. MIES gives a good insight in the early stage of water adsorption. Due to its high surface sensitivity only the outermost layer is investigated [1]. For very low coverages at room temperature water adsorbs dissociatively. At lower temperatures and larger coverages water adsorbs molecularly. The results are compared with available studies on TiO2 single crystals (UPS, TPS, XPS, HREELS).

[1] Y. Harada, S. Masuda and H. Ozaki, Chemical Reviews, Vol.97, 1997

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