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Oxygen adsorption states on Mo(1 1 2) surface studied by HREELS

Surface Science
Publication Date
DOI: 10.1016/s0039-6028(01)01919-7
  • Electron Energy Loss Spectroscopy (Eels)
  • Low Energy Electron Diffraction (Leed)
  • Molybdenum
  • Chemisorption
  • Adatoms
  • Oxygen
  • Vibrations Of Adsorbed Molecules


Abstract Oxygen adsorption on a Mo(1 1 2) has been studied using HREELS, LEED and TPD. Oxygen molecules dissociatively adsorb to occupy quasi-threefold hollow site, long bridge site and atop site on a clean Mo(1 1 2) at 100 K. After annealing this surface to 300 K, a loss peak corresponding to the oxygen atoms at atop sites disappears, changing the adsorption sites into quasi-threefold and long bridge sites. Further annealing to 600 K resulted in the change of the location of oxygen atoms from long bridge site to quasi-threefold hollow site, where the surface shows p(1×2) LEED subspots, indicating that the oxygen atoms in the Mo(1 1 2)–p(1×2)-O surface occupy quasi-threefold hollow sites. Oxygen adsorption on the Mo(1 1 2)–p(1×2)-O surface was also investigated and it was found that oxygen molecules associatively adsorb on the surface to give bridged peroxo species, which dissociates at 200 K to yield oxygen atoms at atop sites. The atop oxygen atoms remain on the surface after annealing to higher temperatures in contrast to the adsorption on clean Mo(1 1 2). Further annealing to 800 K resulted in a disordered surface associated with a molybdenum oxide (Mo x O y ) layer.

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