The main elements of the atomic structure of the Si(111)- 5×2-Au surface have been found by combining off-zone high resolution electron microscopy with 2 electron diffraction minimization and direct phasing of the diffraction data using heavy-atom holography. The structure is different from recent models based upon interpreting scanning tunneling microscope and x-ray data in terms of disordered arrangements of gold atoms, and much simpler. It contains two lines of gold atoms decorating a surface dislocation plus an expanded surface arrangement of silicon atoms. This model appears to explain all the available experimental data and is consistent with an expansive surface stress for Si(111).
ASJC Scopus subject areas
- Physics and Astronomy(all)