Atomic structure of a thallium nanodot lattice formed on the Si(111)-7 × 7 surface
作者： ND Kim , CG Hwang , JW Chung , Y Kim , TC Kim
DOI: 10.1016/J.SUSC.2007.10.022
关键词: Crystallography 、 Microscope 、 Quantum tunnelling 、 Chemistry 、 Nanodot 、 Molecular physics 、 Diffraction 、 Diffractometer 、 Synchrotron 、 Lattice (order) 、 Silicon
摘要: Abstract Using synchrotron X-ray diffraction we have determined the atomic arrangement of a two-dimensional lattice thallium (Tl) nanodots self-assembled on Si(1 1 1)-7 × 7 surface at room temperature. By analyzing set in-plane reflections as well crystal truncation rods, find that structure single Tl nanodot is best described by dynamical model where nine atoms are arranged 0.91 ± 0.19 A above substrate Si adatoms with three central slightly bulging over surrounding six about 0.18 A. Our further suggests quite mobile within attractive basins frozen 7 × 7 surface. The nature naturally explains blurred scanning tunnelling microscope images and may also provide clue to understand intriguing metallic feature nanodots.
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