Water Adsorption on r-TiO2(110): Presence of a well-defined (1x1)-structure as evidenced by He-Atom Scattering

  • chair:

    Osterloh, N. / Silber, D. / Traeger, F. / Wöll, C. (2013)
  • place:

    Physica Status Solidi (2013), 250, 1235-1241
  • Date: 2013

  • Osterloh, N. / Silber, D. / Traeger, F. / Wöll, C. (2013): „Water Adsorption on r-TiO2(110): Presence of a well-defined (1x1)-structure as evidenced by He-Atom Scattering“. In: Physica Status Solidi (2013), 250, 1235-1241

Abstract

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The adsorption of water on r-TiO2(110) has been investigated with thermal desorption spectroscopy (TDS) and helium atom scattering. Conventional TDS using a mass spectrometer and He-TDS monitoring reflected He beam intensity consistently show the existence of a structurally well-defined monolayer as well as a highly ordered second layer of water and a disordered multilayer phase.

He diffraction patterns recorded along the high symmetry [001], equation image, and equation image directions reveal a well-ordered superstructure with (1 × 1) symmetry, providing strong evidence for the absence of a partially dissociated monolayer on the perfect parts of the substrate. No changes in the diffraction patterns are observed after irradiation with UV-light.