Abstract
The interaction of sulfur with the Cu(111) surface has been studied with scanning tunneling microscopy in conjunction with low-energy electron diffraction. Two different phases have been observed. At low exposures, ∽ 20 langmuir of H 2S at room temperature, a previously unknown commensurate phase, which is present in six equivalent domain orientations, has been identified as | 4 1 −1 4 | in matrix notation. At higher exposures, a phase transition to a (√7 X √7)R19° structure takes place. During formation, Cu atoms are consumed from step edges. This indicates that the observed phases are not simple S overlayer structures, but involve a reconstruction of the Cu surface to a sulphide overlayer. By measuring the step area consumed as a function of exposure, the number of Cu atoms in the unit cells of the two phases has been determined. The concentration of the S atoms in the ( 7 × 7 )R19° phase has been measured with Rutherford backscattering.
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