Site Specificity in Stimulated Desorption from TiO2

  • Richard L. Kurtz
  • Roger Stockbauer
  • Theodore E. Madey
Part of the Springer Series in Surface Sciences book series (SSSUR, volume 4)


We have applied synchrotron radiation methods, with other surface characterization techniques, to the study of ion production and desorption from single crystal TiO2. TiO2 is the model system for the Knotek-Feibelman mechanism [1] describing the production and desorption of O+ ions from its surfaces because it is a maximal-valent oxide. The Ti 3d-electron population on the stoichiometric, annealed surface is minimal [2] and the first occupied level, the 3p, is a relatively atomic-like core level. Reneutralization of a hole in this 3p level can occur via an inter-atomic Auger process leaving an O-ligand in a neutral or positively charged state, unstable in the local Madelung potential; this leads to the desorption of O+ ions. Non-maximal-valent TiO2 surfaces can be created, however, involving O-vacancy defects associated with appreciable Ti 3d electron population [2]. With 3d electrons present on surface Ti cations, an intra-atomic Auger decay is strongly favored and a reduced O+ ion yield is expected, based on the predictions of the Knotek-Feibelman mechanism [1]. As the surface Ti valence state is varied, we also produce surfaces having different O-ligand coordination of the surface Ti cations.


Normal Emission Annealed Surface Ti02 Surface Cylindrical Mirror Analyzer Pulse Counting Mode 
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  1. 1).
    M.L. Knotek and P.J. Feibelman, Phys. Rev. Lett. 40, 964 (1978)CrossRefGoogle Scholar
  2. M.L. Knotek and P.J. Feibelman, Surface Sci. 90, 78 (1979).CrossRefGoogle Scholar
  3. 2).
    V.E. Henrich, G. Dresslehaus and H.J. Zieger, Phys. Rev. Lett. 36, 1335 (1976)CrossRefGoogle Scholar
  4. R.H. Tait and R.V. Kasowski, Phys. Rev. B 20, 5178 (1979).CrossRefGoogle Scholar
  5. 3).
    L.E. Firment, Surface Sci. 116, 205 (1982) and references therein.Google Scholar
  6. 4).
    D.M. Hanson, R. Stockbauer ând T.E. Madey, Phys. Rev. B 24, 5513 (1981).CrossRefGoogle Scholar
  7. 5).
    R.L. Kurtz and V.E. Henrich, Phys. Rev. B 25, 3563 (1982)CrossRefGoogle Scholar
  8. V.E. Henrich, H.J. Zeiger and T.B. Reed, Phys. Rev. B 17, 4121 (1978).CrossRefGoogle Scholar
  9. 6).
    C.N. Sayers and N.R. Armstrong, Surf. Sci. 77, 301 (1978)CrossRefGoogle Scholar
  10. R.L. Kurtz and V.E. Henrich, unpublished.Google Scholar
  11. 7).
    E. Bertel, R. Stockbauer and T.E. Madey, Surf. Sci. 141, 355 (1984).CrossRefGoogle Scholar
  12. 8).
    W. Gopel, et. al. Surf. Sci. 139, 333 (1984).Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1985

Authors and Affiliations

  • Richard L. Kurtz
    • 1
  • Roger Stockbauer
    • 1
  • Theodore E. Madey
    • 1
  1. 1.Surface Science DivisionNational Bureau of StandardsGaithersburgUSA

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