A reversible transition between the 23 × 3 and 1 × 1 phases of Au(111) under HClO4 was observed by scanning tunneling microscopy and its dynamics studied on time scales between tens of seconds and hours. The 23 × √3 phase transforms to 1 × 1 as the surface potential is raised above ∼ 440 mV (versus saturated calomel electrode), starting preferentially from step edges. The transition is reversed below ∼ 240 mV. Extra atoms in the higher density 23 × 3 phase can nucleate into monolayer Au clusters. The observed coexistence of phases and hysteresis indicate that the transition is first order.

Original languageEnglish (US)
Pages (from-to)L546-L553
JournalSurface Science
Issue number2
StatePublished - Aug 1 1992

ASJC Scopus subject areas

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


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