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Ag on Ge(111) - 2d X-Ray Structure-Analysis of the Root-3x-Root-3 Superstructure

Surface Science 274(2): 215-221

Autoren/Herausgeber: Dornisch D
Moritz W
Schulz H
Feidenhansl R
Nielsen M
Grey F
Johnson RL
Lelay G
Erschienen: 1992

We have studied the Ag/Ge(111) square-root 3 x square-root 3 superstructure by grazing-incidence X-ray diffraction. In our structural analysis we find striking similarities to the geometry of Au on Si(111). The Ag atoms form trimer clusters with an Ag-Ag distance of 2.94 +/- 0.04 angstrom with the centers of the trimers being located at the origins of the square-root 3 and square-root 3 lattice. The Ag layer is incomplete and at least one substrate layer is distorted.