Step edge diffusion and the structure of nanometer-size Ir islands on the Ir(111) surface

Tsu Yi Fu, Yi Ren Tzeng, Tien T. Tsong

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We report an FIM study of the structure of nanometer-size Ir islands on the Ir(111) surface. In this experiment, the number of atoms in an island is carefully controlled by field evaporation and vapor deposition. When this number can be fitted to a hexagonal atomic arrangement, the stable structure is found to be a perfect hexagon. In other cases, an addition of one ledge atom can reverse the symmetry of a small island or change its shape. We also compare diffusion of adatoms on the Ir(311) and (331) surfaces to that of ledge-atoms along the A- and B-type steps of the (111) layer, and the relative binding energies of a ledge atom at these steps.

Original languageEnglish
Pages (from-to)L691-L696
JournalSurface Science
Issue number2
Publication statusPublished - 1996 Oct 20



  • Iridium
  • Single crystal surfaces
  • Stepped single crystal surfaces
  • Surface diffusion
  • Surface structure, morphology, roughness, and topography

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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