We have studied the adsorption of iodine and bromine onto Au(111) from NaI and NaBr solutions as a function of surface potential using scanning tunneling microscopy. We have found that at low potentials both iodine and bromine form a (√3×√3)R30° structure. At higher potentials a 3 × 3 adlattice was observed for iodine, and a hexagonal close-packed adlattice with a rotation angle of ∼20° was observed for bromine. Adlattice orientations are determined by comparing the adsorbate lattice images and the images of bare Au(111) and by simultaneously imaging the adlattice and the substrate lattice in the case of iodine.

Original languageEnglish (US)
Pages (from-to)5213-5217
Number of pages5
JournalJournal of physical chemistry
Issue number13
StatePublished - Dec 1 1992


ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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