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The atomic structure of the cleaved Si(111)-(2x1) surface refined by dynamical LEED
Physical Review B (2004)
  • Geng Xu, Department of Physics, Zhongshan University, Guangzhou 510275, China
  • Bingcheng Deng, Department of Physics, Zhongshan University, Guangzhou 510275, China
  • Zhaoxian Yu, Department of Physics, Zhongshan University, Guangzhou 510275, China
  • S.Y. Tong, Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
  • M.A. Van Hove, Materials Sciences Division and Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
  • Jona F., Department of Material Science and Engineering, S.U.N.Y. at Stony Brook, New York 11794, USA
  • I. Zasada, Solid State Physics Department, University of Lódz, Pomorska 149/153, Lódz, Poland
Abstract
Several alternative models have been proposed for the much-studied Si(1111)-(2X1) surface structure, including: A reverse-tilted p-bonded chain model [Zitzlsperger et al. Surf. Sci 377, 108 (1997)]; a threebond scission model [by Haneman, Phys. Rev. 121, 1093 (1961)]; and a π-bonded chain model with enhanced vibrations (present work). These models are compared here to the generally accepted modified pbonded chain model [Himpsel et al., Phys. Rev. B. 30, 2257 (1984)], by analyzing low-energy electron
diffraction (LEED) intensity–voltage 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 π-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.
Publication Date
July, 2004
DOI
10.1103/PhysRevB.70.045307
Citation Information
Geng Xu, Bingcheng Deng, Zhaoxian Yu, S.Y. Tong, et al.. "The atomic structure of the cleaved Si(111)-(2x1) surface refined by dynamical LEED" Physical Review B Vol. 70 Iss. 4 (2004) p. 045307-1 - 045307-7 ISSN: 24699969
Available at: http://works.bepress.com/mavanhove/74/