Vibrations in Benzene and Toluene Monolayers on the Basal Plane of Graphite

  • R. Stockmeyer
  • M. Monkenbusch


The dynamics of an ordered (√7 × √7) layer of C6H6 on microcrystalline graphite (Grafoil, Carbopack) has been studied by neutron spectroscopy. A lattice dynamical calculation on the basis of currently used atom-atom interaction potentials was carried out which explains the experimental data. Similar experi- ments with C6H5 - CH3 in the incommensurate phase showed a strong quasi-elastic scattering intensity which is not present in the commensurate phase but which is also present in the case of a C6H5 - CD3 sample. According to distributions of scattered neutrons which have been computed for a 2-dimensional Debye lattice the quasi-elastic scattering intensity is attributed to acoustic modes in the incommensurate adlayer.


Dispersion Curve Scattered Neutron Lattice Mode Neutron Spectrum Graphite Surface 


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  1. 1.
    H. Taub, K. Caneiro, J.K. Kjems, L. Passell, J.P. Mc Tague, Phys. Rev. B 16, 4551 (1977).CrossRefGoogle Scholar
  2. 2.
    M. Nielsen, W.D. Ellenson, J.P. Mc Tague in “Neutron Inelastic Scattering 1977” Vol. II, p. 433, IAEA Wien, 1978.Google Scholar
  3. 3.
    H. Taub, Proceed. of the Int. Conf. and Symp. on Electron Tunneling, Springer Verlag 1977, p. 170.Google Scholar
  4. 4.
    H. Taub, H.R. Danner, Y.P. Sharma, H.L. Mc Murry, R.M. Brugger, Phys. Rev. Lett. 39, 215 (1977).CrossRefGoogle Scholar
  5. 5.
    C. Pisani, F. Ricca, R. Dovesi, Proceed. 2nd Int. Conf. on Solid Surfaces,Jap. J. Appl. Phys. Suppl. 2, pt 2, 269 (1974).Google Scholar
  6. 6.
    L. Battezzati, C. Pisani, F. Ricca, J. Chem. Soc. Faraday Trans. II, 71, 1629 (1975).CrossRefGoogle Scholar
  7. 7.
    F.Y. Hansen, H. Taub, Phys. Rev. B 19 6542 (1979).Google Scholar
  8. 8.
    B. Boddenberg, J.A. Moreno, Z. Naturforschung 31a, 854 (1976).Google Scholar
  9. 9.
    S. Ross, J.P. Olivier, “On Physical Adsorption”, Wiley Inter-science, New York, 1964.Google Scholar
  10. 10.
    W.A. Steele, “The Interaction of Gases with Solid Surfaces”, Pergamon, Oxford 1974.Google Scholar
  11. 11.
    N.N. Avgul, A.V. Kiselev, Chemistry and Physics of Carbon 6, 1 (1970).Google Scholar
  12. 12.
    D.E. Williams, J. Chem. Phys. 47, 4680 (1967).CrossRefGoogle Scholar
  13. 13.
    D.E. Williams, Acta Crystallogr. A30, 71 (1974).CrossRefGoogle Scholar
  14. 14.
    H.A. Govers, Acta Crystallogr. A31, 380 (1975).CrossRefGoogle Scholar
  15. 15.
    M. Monkenbusch, R. Stockmeyer in Proceed. of the Int. Conf. on “Ordering in Two Dimensions” Lake Geneva (1980), North Holland Publ. Comp. Ansterdam.Google Scholar
  16. 16.
    M. Monkenbusch, R. Stockmeyer, to be published in Ber. Bunsen Ges. Phys. Chemie (1980).Google Scholar
  17. 17.
    E.L. Bokhenkov, V.G. Fedotov, E.F. Sheka, I. Natkaniec, M. Sudnik-Hrynkiewicz, S. Califano, R. Righini, Il Nuovo Cimento 44B, 324 (1978).CrossRefGoogle Scholar
  18. 18.
    B.M. Powell, G. Dolling, H. Bonadeo, J. Chem. Phys. 69, 2428 (1978).CrossRefGoogle Scholar
  19. 19.
    C. Huiszoon, F. Mulder, Molecular Physics 38, 1497 (1979).CrossRefGoogle Scholar
  20. 20.
    R. Stockmeyer, Jül.-Report 1162 (1975).Google Scholar
  21. 21.
    D. Glasenapp, H.J. Stornik, R. Wagner, Jul-Spez - 68 (1980) ISSN 0343–7639.Google Scholar
  22. 22.
    M. Monkenbusch, to be published, Jöl.-Report.Google Scholar
  23. 23.
    G. Armand, P. Masri, L. Dobrzynski, J. Vac. Sci. Technol. 9, 705 (1971).Google Scholar
  24. 24.
    A.D. Novaco, J.P. Mc Tague, Phys. Rev. B20, 2469 (1979).CrossRefGoogle Scholar
  25. 25.
    W. Ludwig, “Festkörperphysik”, Akademische Verlagsanstalt Wiesbaden 1978.Google Scholar
  26. 26.
    G. Gilat in “Methods of Computational Physics”, Vol. 15, Academic Press, London 1976.Google Scholar
  27. 27.
    Supelco Inc. Bellefonte, PA Bulletin 738 B.Google Scholar
  28. 28.
    Trade name by Union Carbide for a foil, consisting of partially oriented graphite microcrystals.Google Scholar
  29. 29.
    J.G. Dash, “Films on Solid Surfaces”, Academic Press, London (1975).Google Scholar
  30. 30.
    S.C. Ying, Phys. Rev. B 3, 4160 (1971).CrossRefGoogle Scholar
  31. 31.
    A.D. Crowell, J. Chem. Phys. 22, 1397 (1954).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1982

Authors and Affiliations

  • R. Stockmeyer
    • 1
  • M. Monkenbusch
    • 1
  1. 1.Institut für FestkörperforschungKernforschungsanlage Jülich GmbHJülichGermany

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