Advertisement

Research on Chemical Intermediates

, Volume 28, Issue 2–3, pp 205–214 | Cite as

O- radical ions on MgO: a tool for a structural description of the surface

  • M. Chiesa
  • M. C. Paganini
  • E. Giamello
  • D. M. Murphy
Article

Abstract

The present contribution aims to show that detailed information on structure and location of surface defective sites (surface vacancies, low co-ordination sites) can be obtained by combining data on the chemical reactivity of polycrystalline surfaces and EPR data. The use of nitrous oxide for bleaching trapped electron centres at the surface of MgO produces a remarkable variety of O- species, which differ in their values of the energy splitting (δE) term between the pz and the other two p orbitals of the radical ion. This indicates the existence of a corresponding variety of surface traps having different structural features.

SURFACE POINT DEFECTS MGO EPR COLOUR CENTRES 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

REFERENCES

  1. 1.
    M. Che and A. J. Tench, Adv. Catal. 31, 77 (1982).Google Scholar
  2. 2.
    M. Che and A. J. Tench, Adv. Catal. 32, 1 (1983).Google Scholar
  3. 3.
    A. Bielanski and J. Haber, Oxygen in Catalysis.Dekker, New York (1991).Google Scholar
  4. 4.
    M. Che and E. Giamello, Studies in Surf. Sci. Catal. 57B, 265 (1990).Google Scholar
  5. 5.
    D. J. Driscoll, W. Martir, J. X. Wang and J. H. Lunsford, J. Am. Chem. Soc. 107, 58 (1985).Google Scholar
  6. 6.
    A. J. Tench and T. Lawson, Chem. Phys. Lett. 7, 459 (1970).Google Scholar
  7. 7.
    A. J. Tench, T. Lawson and J. F. J. Kibblewhite, J. Chem. Soc. Faraday Trans. I 68, 1169 (1972).Google Scholar
  8. 8.
    M. C. Paganini, M. Chiesa, E. Giambello, S. Coluccia, G. Martra, D. M. Murphy and G. Pacchioni, Surf. Sci. 421, 246 (1999).Google Scholar
  9. 9.
    D. R. Smith and A. J. Tench, Chem. Comm. 1113 (1968).Google Scholar
  10. 10.
    E. Giamello, D. M. Murphy, L. Marchese, G. Martra and A. Zecchina, J. Chem. Soc. Faraday Trans. 89, 3715 (1993).Google Scholar
  11. 11.
    M. Chiesa, M. C. Paganini, E. Giamello, D. M. Murphy, Langmuir 13, 5306 (1997).Google Scholar
  12. 12.
    E. Giamello, D. M. Murphy, L. Marchese, G. Martra and A. Zecchina, J. Chem. Soc. Faraday Trans. 89, 3715 (1993).Google Scholar
  13. 13.
    M. Chiesa, E. Giamello, D. M. Murphy, G. Pacchioni, M. C. Paganini, R. Soave, G. Pacchioni and Z. Sojka, J. Phys. Chem. B 105, 497 (2001).Google Scholar
  14. 14.
    E. Giamello, P. Ugliengo and E. Garrone, J. Chem. Soc. Faraday Trans. I 85, 1373 (1989).Google Scholar
  15. 15.
    E. Knotzinger, K. H. Jacob, S. Singh and P. Hofmann, Surf. Sci. 290, 388 (1993).Google Scholar
  16. 16.
    J. R. Brailsford, J. R. Morton and L. E. Vannotti, J. Chem. Phys. 49, 2237 (1968).Google Scholar
  17. 17.
    M. Sterrer, O. Diwald and E. Knotzinger, J. Chem. Phys. B 104, 3601 (2000).Google Scholar
  18. 18.
    G. Pinarello, C. Pisani, M. Chiesa, M. C. Paganini and E. Giamello, Surf. Sci. 494, 95 (2001).Google Scholar

Copyright information

© VSP 2002 2002

Authors and Affiliations

  • M. Chiesa
  • M. C. Paganini
  • E. Giamello
  • D. M. Murphy

There are no affiliations available

Personalised recommendations