Oxygen-induced restructuring of Ag(111)

X. Bao, J. V. Barth, G. Lehmpfuhl, R. Schuster, Y. Uchida, R. Schlögl, G. Ertl

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Interaction of oxygen with Ag(111) surfaces at atmospheric pressure and at a temperature > 800 K leads to the activated formation of a new phase with long-rangeorder exhibiting periodicities of about 70 Å in the [112] direction and 40 Å in the [110] direction and a slight rotation by about 2° with respect to the substrate lattice, as probed by means of scanning tunneling microscopy (STM), reflection electron microscopy (REM), and reflection high energy electron diffraction (RHEED). The incorporation of oxygen atoms in subsurface sites causes a slight expansion of the topmost layer by about 3% which accounts for the formation of the observed moiré pattern. The superstructure is readily removed by reducing agents.

Original languageEnglish
Pages (from-to)14-22
Number of pages9
JournalSurface Science
Issue number1-2
StatePublished - 10 Mar 1993
Externally publishedYes


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