Abstract
The equilibrium between one adsorbed phase of sulfur ions (loosely packed) and a reconstructed two-dimensional copper sulfide phase, is studied in ultrahigh vacuum on low index faces of copper. The nucleation from the loosely packed phase of nuclei of the two-dimensional sulfide is characterized under conditions for which sulfur dissolution or evaporation is negligible. The domain of the temperature-coverage diagram for which adsorbed sulfur is present at equilibrium in the two phases is determined. The data lead to an interpretation of adsorption isotherms at low temperature and point to the existence of a critical temperature above which the evolution of surface structure towards saturation proceeds without discontinuity.
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