The Adsorption and Co-Adsorption with CO of NO on Cu(110) Studied with EELS and LEED

  • J. F. Wendelken


The adsorption of NO on Cu(110) and its interaction with co-adsorbed CO at a crystal temperature of 80 K have been investigated with EELS. Dissociation of NO occurring at higher temperatures or higher exposures has been studied with both EELS and LEED. For exposures of less than 1.2 Langmuir of 14NO at a crystal temperature of 80 K, vibrational energies are initially observed at 106, 195, and 262 meV with EELS. With increasing NO coverage, the first peak reaches a maximum intensity and then diminishes while the second peak grows. However, both peaks vanish for exposures greater than 1.2 Langmuirs. If the crystal is heated above 113 K both peaks also vanish. The third peak, which represents the CO stretching vibration of less than 5 % of a monolayer of CO, shifts upward in energy with increasing NO coverage but does not shift back when the first two peaks vanish. Hence, the NO or its products do not desorb under these conditions. With higher exposures of NO followed by heating to 500 K a distinct loss peak at 49 meV associated with Oad in the long bridge site is observed. No additional vibrational peak is observed for nitrogen. However, a comparison of LEED patterns produced following NO and O adsorption at 80 K followed by annealing to 500 K indicates that Nad is also present. By using the isotopic energy shifts obtained by adsorbing 15NO, the two low exposure peaks are assigned to the bending and stretching modes of adsorbed NO, respectively. Since the intensity of the bending mode peak is greater initially than the stretching mode, it is concluded that the NO is initially adsorbed in a strongly bent configuration. Co-adsorption with 0.25 monolayer of CO results in a substantial suppression of the bending mode and energy shifts in both the CO and NO stretching vibrations.


Vibrational Energy Energy Shift Electron Energy Loss Spectroscopy Loss Peak Bridge Site 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    G.E. Thomas, W.H. Weinberg, Phys. Rev. Lettérs 41, 1181 (1978).CrossRefGoogle Scholar
  2. 2.
    A.F. Carley, S.Rassias, M.W. Roberts, Wang Tang-Han, S.rf. Sci. 84, L227 (1979).Google Scholar
  3. 3.
    S. Lehwald, J.T. Yates,Jr., H. Ibach, Proceedings of the International Conference on Solid Surfaces and Third European Conference on Surface Science, Cannes, France September 22–26, 1980, to be published.Google Scholar
  4. 4.
    H.P. Bonzel, G. Pirug, Surf. Sci. 67, 45 (1977).CrossRefGoogle Scholar
  5. 5.
    G. Pirug, H.P. Bonzel, H. Hopster, H. Ibach, J. Chem. Phys. 71, 593 (1979).CrossRefGoogle Scholar
  6. 6.
    H. Conrad, G. Ertl, J. Köppers, E.E. Latta, Surface Sci. 56, 296 (1975).CrossRefGoogle Scholar
  7. 7.
    J.F. Wendelken, S. Lehwald, work in progress.Google Scholar
  8. 8.
    O.W. Johnson, M.H. Matloob, M. Wyn Roberts, J.C.S. Chem. Comm. 40 (1978).Google Scholar
  9. 9.
    H. Ibach, S. Lehwald, Surface Sci. 76, 1 (1978).CrossRefGoogle Scholar
  10. 10.
    Handbook of Chemistry and Physics, 46th ed. (Chemical Rubber, Cleveland, (1965)).Google Scholar
  11. 11.
    R. Eisenberg, C.D. Meyer, Acc. Chem. Res. 8, 26 (1975).CrossRefGoogle Scholar
  12. 12.
    J.F. Wendelken, F.M. Propst, Rev. Sci. Instrum, 47, 1069 (1976).CrossRefGoogle Scholar
  13. 13.
    J.F. Wendelken, S.P. Withrow, P.S. Herrell, Rev. Sci. Instrum. 51, 255 (1980).CrossRefGoogle Scholar
  14. 14.
    J.F. Wendelken and M.V.K. Ulehla, J. Vac. Sci. Technol. 16, 441 (1979).CrossRefGoogle Scholar
  15. 15.
    J.F. Wendelken, to be published.Google Scholar
  16. 16.
    T. Shimanouchi, Tables of Molecular Vibrational Frequencies, Consolidated Volume I, Nat. Stand. Ref. Data Ser., Nat. Bur. Stand. (U.S.) 39, 1972.Google Scholar
  17. 17.
    H. Froitzheim in Electron Spectroscopy for Surface Analysis, ed. by H. Ibach ( Springer-Verlag, New York, 1977 ).Google Scholar
  18. 18.
    T. Shimanouchi:, Tables of Molecular Vibrational Frequencies, Volume II, J. Phys. Chem. Ref. Data 6, 993 (1977).CrossRefGoogle Scholar
  19. 19.
    E. Miki, K. Mizumachi, T. Ishimori, H. Okuno, Bull. Chem. Soc. Japan 47, 656 (1974).CrossRefGoogle Scholar
  20. 20.
    E. Evans, D.L. Mills, Phys. Rev. B5, 4126 (1972).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1982

Authors and Affiliations

  • J. F. Wendelken
    • 1
  1. 1.Solid State DivisionOak Ridge National LaboratoryOak RidgeUSA

Personalised recommendations