Journal of Chemical Physics
Feedback | Help | Exit
The Journal of Chemical Physics
Search:
   
 
 
 
Previous Article
Consistently averaged hydrodynamic interaction for Rouse dumbbells: Translational diffusivity
The recently developed Hookean dumbbell model with consistently averaged hydrodynamic interaction is used to discuss the translational diffusivity of polymers in dilute solutions undergoing homogeneou...
Next Article
SANS studies of concentrated protein solutions: Determination of the charge, hydration, and H/D exchange in cytochrome C
Small angle neutron scattering (SANS) was used to study a series of concentrated protein solutions containing horse heart cytochrome C ranging from 0.6 to 24 g/dL at two ionic strengths. Since the sol...

LEED structure analysis of the clean and (2×1)H covered Pd(110) surface

J. Chem. Phys. 87, 6191 (1987); doi:10.1063/1.453495

Issue Date: 15 November 1987

You are logged in to this journal.

M. Skottke, R. J. Behm, and G. Ertl
Fritz Haber-Institut der Max Planck-Gesellschaft, D-1000 Berlin 33, Faradayweg 4-6, Federal Republic of Germany

V. Penka and W. Moritz
Institut für Kristallographie, Universität München, D-8000 München 2, Theresienstrasse 41, Federal Republic of Germany
From an analysis of the low-energy electron diffraction (LEED) intensities we have determined the oscillatory distortion of the topmost interlayer spacings of the clean and the (2×1)H covered Pd(110) surface as well as the exact adsorption geometry in this latter structure, which is formed at T<180 K at a coverage of thetaH<=1.0. An R-factor analysis was used for quantitative comparison with the experimental data. The oscillatory distortion of the clean surface— d12=−5.1±1.5%, d23=+2.9±1.5%, d34 at its bulk value of 1.37 Å (with R factors RP=0.22 , RZJ=0.14 )— is found to be reduced by the H adlayer to d12=−2.2±1.5%, d23=+2.9±1.5%, and d34=bulk value. The H atoms are adsorbed on quasi-threefold sites with equal distances of 2.0±0.1 Å to the two nearest Pd neighbors in the topmost and the closest Pd atom in the second layer, leading to an effective radius of the H atom of rH=0.6±0.1 Å. The long-bridge adsorption site, (octahedral) subsurface sites, or a hydrogen induced reconstruction via a lateral displacement of topmost Pd atoms by more than ±0.1 Å can clearly be ruled out. These structural data, which are in good agreement with those of ordered Had structures on Ni(110) and Fe(110), characterize the (2×1)H structure on Pd(110) as being a typical adsorbate structure. There is no indication of either direct occupation of distinct subsurface or of near surface adsorption sites in this structure, nor does it open up channels for surface penetration, e.g., by a strong distortion of the topmost Pd substrate layers. In contrast to Ni(110) and Rh(110) the island growth of the (2×1)H structure on Pd(110) indicates predominantly attractive, indirect adatom–adatom interaction which, however, are of distinctly different nature than those causing island formation in the Pd–hydride phase. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 19 February 1987; accepted 10 August 1987
Permalink: http://link.aip.org/link/?JCPSA6/87/6191/1
FULL TEXT OPTIONS   (FREE)
Download PDF (948 kB) View Cart

KEYWORDS and PACS

Keywords
PACS
  • 68.35.Bs
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Solid surfaces and solidsolid interfaces (including bicrystals) Geometry; atomic and molecular orientation; crystal shapes; surface topography
  • 68.35.Dv
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Solid surfaces and solidsolid interfaces (including bicrystals) Composition; defects and impurities
  • 61.14.Hg
    Structure of liquids and solids; crystallography Electron determination of structures Low-energy electron diffraction (LEED) and reflection high-energy electron diffraction (RHEED) techniques
  • 82.65.My
    Physical chemistry Surface processes Sorption and accommodation coefficients
  • YEAR: 1987

RELATED DATABASES

Web of Science

View this record in Web of Science

View Web of Science related articles

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (63)
View in Separate Window/Tab
  1. Hydrogen in Metals I and II, Topics in Applied Physics Vols. 28–29, edited by G. Alefeld and J. Volkl (Springer, Berlin, 1978).
  2. R. J. Behm, V. Penka, M. G. Cattania, K. Christmann, and G. Ertl, J. Chem. Phys. 78, 7486 (1983). [ISI] [ChemPort]
  3. M. G. Cattania, V. Penka, R. J. Behm, K. Christmann, and G. Ertl, Surf. Sci. 126, 382 (1983). [Inspec] [ISI] [ChemPort]
  4. M. Baumberger, W. Stocker, and K. H. Rieder, Appl. Phys. A 41, 151 (1986). [Inspec]
  5. S. M. Foiles and M. S. Daw, J. Vac. Sci. Technol. A 3, 1565 (1985). [ISI]
  6. T. E. Felter and R. H. Stulen, J. Vac. Sci. Technol. A 3, 1566 (1985); [ISI]
    7. R. H. Stulen and G. D. Kubiak, ibid. 4, 1427 (1986). [ISI]
  7. T. E. Felter, S. M. Foiles, M. S. Daw, and R. H. Stulen, Surf. Sci. 171, L379 (1986). [Inspec] [ISI] [ChemPort]
  8. M. S. Daw and S. M. Foiles, Phys. Rev. B 35, 2128 (1987). [ISI] [MEDLINE] [ChemPort]
  9. G. E. Gdowski, R. H. Stulen, and T. E. Felter, J. Vac. Sci. Technol. A 5, 1103 (1987). [ISI]
  10. K. H. Rieder, M. Baumberger, and W. Stocker, Phys. Rev. Lett. 51, 1799 (1983). [ISI] [ChemPort]
  11. J. T. Yates, Jr., C. H. F. Peden, J. E. Houston, and D. W. Goodman, Surf. Sci. 160, 37 (1985). [Inspec] [ISI]
  12. P. Feulner, H. Pfhür, P. Hofmann, and D. Menzel, Surf. Sci. 173, L576 (1986). [Inspec] [ChemPort]
  13. H. Conrad, G. Ertl, and E. E. Latta, Surf. Sci. 41, 435 (1974). [Inspec] [ISI]
  14. K. H. Rieder and T. Engel, Phys. Rev. Lett. 43, 373 (1979); [ISI] [ChemPort]
    15. 45, 824 (1980); [ISI]
    Surf. Sci. 164, 55 (1985). [Inspec] [ISI] [ChemPort]
  15. V. Penka, K. Christmann, and G. Ertl, Surf. Sci. 136, 307 (1984). [Inspec] [ISI]
  16. W. Reimer, V. Penka, M. Skottke, R. J. Behm, and G. Ertl, Surf. Sci. 186, 45 (1987). [Inspec] [ISI] [ChemPort]
  17. K. Christmann, M. Ehsasi, W. Hirschwald, and J. H. Block, Chem. Phys. Lett. 131, 192 (1986). [Inspec] [ChemPort]
  18. N. J. DiNardo and E. W. Plummer, Surf. Sci. 150, 89 (1985), and references therein. [Inspec] [ISI] [ChemPort]
  19. J. P. Muscat, Surf. Sci. 110, 389 (1981); [Inspec] [ISI] [ChemPort]
    20. M. S. Daw and S. M. Foiles, in The Structure of Surfaces, edited by M. A. van Hove and S. Y. Tong (Springer, Berlin, 1984).
  20. G. Ertl and J. Küppers, Low Energy Electrons and Surface Chemistry (Verlag Chemie, Weinheim, 1985).
  21. E. Lang, P. Heilmann, G. Hanke, K. Heinz, and K. Müller, Appl. Phys. 19, 7 (1979).
  22. J. B. Pendry, Low Energy Electron Diffraction (Academic, London, 1974).
  23. W. Moritz, J. Phys. C 17, 353 (1984).
  24. V. L. Moruzzi, J. F. Janak, and A. R. Williams, Calculated Electronic Properties of Metals (Pergamon, New York, 1978).
  25. R. Feder and W. Moritz, Surf. Sci. 77, 505 (1978). [Inspec] [ChemPort]
  26. W. Moritz, R. Imbihl, R. J. Behm, G. Ertl, and T. Matsushima, J. Chem. Phys. 83, 1959 (1985).
  27. W. Hösler, W. Moritz, R. Feder, and E. Tanum, Surf. Sci. 171, 55 (1986). [Inspec] [ISI]
  28. E. Zanazzi and F. Jona, Surf. Sci. 62, 61 (1977). [Inspec] [ISI] [ChemPort]
  29. J. B. Pendry, J. Phys. C 13, 937 (1980).
  30. K. Müller and K. Heinz (personal communication).
  31. Y. Gauthier, R. Baudoing, Y. Joly, C. Gaubert, and J. Rundgren, J. Phys. C 14, 4547 (1984).
  32. M. L. Xu and S. Y. Tong, Phys. Rev. B 31, 6332 (1985). [ISI] [MEDLINE] [ChemPort]
  33. D. L. Adams, L. E. Petersen, and C. S. Sørensen, J. Phys. C 18, 1753 (1985). [Inspec] [ISI] [ChemPort]
  34. R. Baudoing, Y. Gauthier, and Y. Joly, J. Phys. C 18, 4061 (1985). [ISI]
  35. D. L. Adams, H. B. Nielsen, J. N. Andersen, I. Stensgaard, R. Feidenhans'l, and J. E. Sørensen, Phys. Rev. Lett. 49, 669 (1982). [ISI] [ChemPort]
  36. D. L. Adams, H. B. Nielsen, and J. N. Andersen, Surf. Sci. 128, 294 (1983). [Inspec] [ISI] [ChemPort]
  37. H. L. Davies and J. R. Noonan, Surf. Sci. 126, 245 (1983). [Inspec] [ISI] [ChemPort]
  38. I. Stensgaard, R. Feidenhans'l, and J. E. Sørensen, Surf. Sci. 128, 281 (1983). [Inspec] [ISI] [ChemPort]
  39. A. P. Baddorf, I. W. Lyo, E. W. Plummer, and H. L. Davies, J. Vac. Sci. Technol. A 5, 782 (1987). [ISI] [ChemPort]
  40. C. J. Barnes, M. Q. Ding, M. Lindroos, R. D. Diehl, and D. A. King, Surf. Sci. 162, 59 (1985). [Inspec] [ISI]
  41. J. R. Noonan and H. L. Davies, Surf. Sci. 115, L75 (1982). [Inspec] [ChemPort]
  42. M. Alff and W. Moritz, Surf. Sci. 80, 24 (1979). [Inspec]
  43. J. N. Andersen, H. B. Nielsen, L. Petersen, and D. L. Adams, J. Phys. C 17, 173 (1984). [Inspec] [ISI] [ChemPort]
  44. J. R. Noonan and H. L. Davies, Phys. Rev. B 29, 4349 (1984). [ISI]
  45. K. M. Ho and K. P. Bohnen, Phys. Rev. Lett. 56, 934 (1986). [ISI] [MEDLINE] [ChemPort]
  46. G. Kleinle, V. Penka, R. J. Behm, G. Ertl, and W. Moritz, Phys. Rev. Lett. 57, 148 (1987).
  47. K. H. Rieder and W. Stacker, Phys. Rev. Lett. 57, 2548 (1986). [ISI] [MEDLINE] [ChemPort]
  48. R. J. Behm, K. Christmann, and G. Ertl, Surf. Sci. 99, 320 (1980). [Inspec] [ISI] [ChemPort]
  49. H. Brodowsky, Z. Phys. Chem. N. F. 44, 129 (1965). [ChemPort]
  50. A. M. Baró, H. Ibach, and D. Bruchmann, Surf. Sci. 130, 1 (1983). [Inspec] [ISI] [ChemPort]
  51. K. Christmann, R. J. Behm, G. Ertl, M. A. van Hove, and W. H. Weinberg, J. Chem. Phys. 70, 4168 (1979). [ISI] [ChemPort]
  52. C. Nyberg and C. G. Tengstal, Surf. Sci. 126, 163 (1983). [Inspec] [ChemPort]
  53. S. Anderson, Chem. Phys. Lett. 55, 185 (1979). [Inspec] [ISI] [ChemPort]
  54. D. Nordlander, S. Holloway, and J. K. Nørskov, Surf. Sci. 136, 59 (1984). [Inspec] [ISI] [ChemPort]
  55. J. K. Nørskov, Phys. Rev. Lett. 48, 1620 (1982). [ISI]
  56. A. C. Switendick, in Ref. 1.
  57. E. O. Wollau, J. W. Cable, and W. C. Koehler, J. Phys. Chem. Solids 24, 1141 (1963).
  58. T. F. Koetzle, R. K. McMullan, R. Bau, D. W. Hart, D. L. Tipton, and R. D. Wilson, Adv. Chem. 167, 61 (1978).
  59. T. Engel and H. Kuipers, Surf. Sci. 90, 162 (1979). [Inspec] [ISI] [ChemPort]
  60. H. Niehus, C. Hiller, and G. Comsa, Surf. Sci. 173, L599 (1986). [Inspec] [ISI] [ChemPort]
  61. W. Moritz, R. J. Behm, G. Ertl, G. Kleinle, V. Penka, W. Reimer, and M. Skottke, Surf. Sci. (in press).
  62. R. J. Behm, V. Penka, K. Christmann, G. Ertl, and R. J. Schwankner, in The Structure of Surfaces, edited by M. A. van Hove and S. Y. Tong (Springer, Berlin, 1984).
  63. K. Christmann, V. Penka, R. J. Behm, F. Chehab, and G. Ertl, Solid State Commun. 51, 487 (1984). [Inspec] [ISI] [ChemPort]

Copyright © American Institute of Physics