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Diffusion of adsorbed particles on surfaces with channeled atomic corrugation

  • A. T. Loburets
  • A. G. Naumovets
  • Yu. S. Vedula
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 519)

Abstract

We review experimental data on surface diffusion of electropositive adsorbates (alkali, alkaline-earth and rare-earth elements) on substrates with strongly anisotropic («channeled») atomic corrugation. The substrates were (112) surfaces of tungsten and molybdenum. The adatoms under study form rarefied chain structures at low coverages, dense commensurate structures at medium coverages and uniaxially incommensurate structures at coverages approaching a close-packed monolayer. At sufficiently low temperatures, the adsorbate diffusion on the channeled surfaces has a quasi-one-dimensional character (proceeds actually only along the channels). Its rate is strongly dependent on the coverage and exhibits a pronounced correlation with the phase transitions occurring in the overlayers when the coverage varies. All the adsorbates studied show an enhancement of the diffusion rate in the region of the commensurate-incommensurate phase transition. This feature is ascribed to the operation of a collective mechanism of surface diffusion effected by the movements of domain walls, which separate commensurate domains and have properties of topological solitons. At sub- and superstoichiometric coverages, vacancy and interstitial solitons are formed, respectively. They show different mobilities. We also present experimental results illustrating sensitivity of the diffusion kinetics to surface defects, and anomalous diffusion characteristics observed under some conditions.

Keywords

Domain Wall Surface Diffusion Adsorbed Particle Topological Soliton Coverage Profile 
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.

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References

  1. Abraham, F. (1981): Phys. Rep. 80, 339CrossRefADSGoogle Scholar
  2. Ala-Nissila, T., Ying, S.C., (1992): Progr. Surf. Sci. 39, 227CrossRefADSGoogle Scholar
  3. Bagehorn, F., Lorenc, J., Oleksy, Cz. (1996): Surf. Sci. 349, 165CrossRefADSGoogle Scholar
  4. Bayat, B., Wassmuth, H.W. (1983): Surf. Sci. 133, 1CrossRefADSGoogle Scholar
  5. Braun, O.M., Medvedev, V.K., (1989): Usp. Fiz. Nauk 157, 631; English translation: Sov. Phys. Uspekhi 157, 328CrossRefGoogle Scholar
  6. Braun, O.M., Zelenskaya, I.I., Kivshar, Yu.S. (1994): Int. J. Mod. Phys. B8, 2353ADSGoogle Scholar
  7. Loburets, A.T., Naumovets, A.G., Vedula, Yu.S. (1982): Surf. Sci. 120, 347CrossRefADSGoogle Scholar
  8. Loburets, A.T., Naumovets, A.G., Senenko, N.B., Vedula, Yu.S., (1997): Zs. Phys. Chem. 202, 75Google Scholar
  9. Loburets, A.T., Naumovets, A.G., Vedula, Yu.S., (1997): Surface Diffusion: Atomistic and Collective Processes, ed. by M.C. Tringides (Plenum, New York) p. 509Google Scholar
  10. Loburets, A.T., Naumovets, A.G., Vedula, Yu.S. (1998): Surf. Sci. 399, 297CrossRefADSGoogle Scholar
  11. Lyuksyutov, I.F., Medvedev, V.K., Yakovkin, I.N. (1981): Zhur. Eksper. Theor. Fiz. 80, 2452; English translation: Sov. Phys. JETP 53 1284Google Scholar
  12. Lyuksyutov, I.F., Naumovets, A.G., Vedula, Yu.S. (1986): Solitons, ed. by S.E. Trullinger, V.E. Zakharov and V.L. Pokrovsky (Elsevier, Amsterdam) p. 605Google Scholar
  13. Lyuksyutov, I., Naumovets, A.G., Pokrovsky, V.L. (1992): Two-Dimensional Crystals (Academic Press, Boston)Google Scholar
  14. Lyuksyutov, I.F., Pokrovsky, V.L. (1981): Pis'ma v ZhETF 33, 343; English translation: JETP Letters 33, 326ADSGoogle Scholar
  15. Masuda, T., Barnes, C., Hu, P., King, D.A. (1992): Surf. Sci. 276, 122CrossRefADSGoogle Scholar
  16. Medvedev, V.K., Yakivchuk, A.I. (1975): Ukrainskii Fiz. Zhurnal 20, 1900 (in Russian)Google Scholar
  17. Milchev, A., Markov, I. (1984): Surf. Sci. 136, 503 and 515CrossRefADSGoogle Scholar
  18. Naumovets, A.G., Paliy, M.V., Vedula, Yu.S., Loburets, A.T. Senenko, N.B. (1995): Progr. Surf. Sci. 48, 59CrossRefADSGoogle Scholar
  19. Naumovets, A.G., Vedula, Yu.S., (1985): Surf. Sci. Rep. 4, 365CrossRefGoogle Scholar
  20. Naumovets, A.G., Paliy, M.V., Vedula, Yu.S. (1993): Phys. Rev. Lett. 71, 105CrossRefADSGoogle Scholar
  21. Naumovets, A.G., Paliy, M.V., Vedula, Yu.S. (1994): Diffusion Processes: Experiment, Theory, Simulations, ed. by A. Pękalski, Springer Verlag, Berlin) p. 53CrossRefGoogle Scholar
  22. Philibert, J., (1991): Atom Movements. Diffusion and Mass Transport in Solids (Les Editions de Physique, Les Ulis)Google Scholar
  23. Schuster, R., Barth, J., Ertl, G., Behm, R. (1992): Phys. Rev. Lett. 69, 2547CrossRefADSGoogle Scholar

Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • A. T. Loburets
    • 1
  • A. G. Naumovets
    • 2
  • Yu. S. Vedula
    • 1
  1. 1.Yu. V. Kondratyuk Technical UniversityPoltavaUkraine
  2. 2.Institute of PhysicsNatl. Academ. of Sciences of UkraineKiev 22Ukraine

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