We report on the electronic structure rutile TiO2(110) surfaces following the exposure to methanol. Two-photon photoemission (2PP) spectra reveal a strong resonance at 2.2–2.4 eV above Fermi level, which gains maximum intensity at 1 ML coverage of methanol. From the coverage, temperature and emission angle dependence of the methanol induced spectral features and similarities to a related state ...

Evidence for a structural phase transition from rutile -CrO2 phase I P42/mnm to orthorhombic -CrO2 phase II CaCl2-like, Pnnm is presented using angle-resolved synchrotron x-ray diffraction and highsensitivity confocal Raman spectroscopy. The transition to the CaCl2 structure, which appears to be second order, occurs at 12±3 GPa without any measurable discontinuity in volume, but is accompanied ...

RÉSUMÉ. Des nanotubes de dioxyde de titane (TiO2) ont été fabriqués par anodisation d’une feuille de titane dans une solution d’acide fluorhydrique et ensuite recuits à différentes températures entre 300°C et 600°C. Nous avons cherché dans ce travail la corrélation entre la structure cristalline des nanotubes de TiO2 et leur capacité à photodégrader une solution d’acide orange 7. La couche de n...

Variation of the local electronic structure at rutile TiO2(110) surfaces was studied by scanning tunneling spectroscopy ~STS!. Structural surface features such as step edges, (132) reconstructed strands, and their terminations were correlated to changes in tunneling spectra. In particular, band-gap states, associated with a reduced surface, showed characteristic variations. In addition, electro...