Photoelectron diffraction study of the atomic geometry of the Si(111)√3×√3-Sb surface

Abstract

X-ray photoelectron diffraction patterns of Sb 3d core levels have been measured for the Si(111) 3 × 3 - Sb surface. The diffraction patterns are anazed kinematically using a spherical- and a plane-wave formalism. It has turned out that a trimer of Sb atoms is present on every 3 × 3 site above the substrate. A “milk-stool” type of structure is tentatively inferred for a structural unit of the Si 3 × 3 - Sb surface.