Abstract
Azimuthal X-ray photoelectron diffraction (XPD) patterns have been measured for the Si(111)( 3× 3 ) R30°- Ag surface. Ag-coverage and substrate-temperature dependences of the azimuthal XPD patterns show evidence for a single phase of the 3× 3 structure. From kinematical analysis of the XPD patterns, it is proposed that a slightly embedded Ag honeycomb framework with a laterally displaced first Si layer is formed. The proposed honeycomb model is not compatible with honeycomb models proposed from SEXAFS and CMTA LEED. A contradictory finding of the saturation Ag coverage of 1 ML for the 3× 3 structure is explained by the results of a recent micro-Auger analysis of Hanbücken et al. A concrete structural model for the 3× 3 surface is proposed.
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