Skip to main content
eScholarship
Open Access Publications from the University of California

The atomic structure of the cleaved Si(111)-(2x1) surface refined by dynamical LEED

  • Author(s): Xu, Geng
  • Deng, Bingcheng
  • Yu, Zhaoxian
  • Tong, S.Y.
  • Van Hove, M.A.
  • Jona, F.
  • Zasada, I.
  • et al.
Abstract

New or modified models have been proposed for the much-studied Si(111)-(2x1) surface structure, including: a reverse-tilted p-bonded chain model (by Zitzlsperger et al); a three-bond scission model (by Haneman et al); and a p-bonded chain model with enhanced vibrations (present work). These models are compared here to the generally accepted modified p-bonded chain model (by Himpsel et al, 1984), by analyzing low-energy electron diffraction (LEED) I-V curves measured earlier. Using the efficient automated tensor LEED technique, the models can be refined to a much greater degree than with earlier methods of LEED analysis. This study distinctly favors the earlier modified p-bonded chain model, but with strongly enhanced vibrations. To compare models that have different numbers of adjustable free parameters a Hamilton ratio test is used: it can distinguish between improvement due to a better model and improvement due only to more parameters.

Main Content
Current View