Electron Diffraction and Photoemission Studies of Clean and Water-Covered 
Si(5,5,12) and Si(112) Surfaces

Ranke, Wolfgang; Xing, Y. R.

doi:10.1142/S0218625X97000043

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Electron Diffraction and Photoemission Studies of Clean and Water-Covered Si(5,5,12) and Si(112) Surfaces

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Ranke, Wolfgang
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Ranke, W., & Xing, Y. R. (1997). Electron Diffraction and Photoemission Studies of Clean and Water-Covered Si(5,5,12) and Si(112) Surfaces. Surface Review and Letters, 04(01), 15-23. doi:10.1142/S0218625X97000043.

Cite as: https://hdl.handle.net/21.11116/0000-0008-EC38-0

Abstract

The structure of silicon surfaces in the orientation range (113)–(5,5,12)–(337)–(112) has been investigated using high resolution LEED and photoemission both on a spherical and on flat samples. We find that Si(5,5,12) [5.3° from (113) and 0.7° from (337)] is the only stable orientation between (113) and (111) and confirm the result of Baski et al. [Science 269, 1556 (1995)] that it has a 2×1 superstructure with a very large unit cell of 7.68×53.5 Å². Adsorption measurements of water on Si(5,5,12) yield a mobile precursor kinetics with two kinds of regions saturating at 0.25 and 0.15 ML which are related to adsorption on different sites. Using these results, a modified structure model is proposed. Surfaces between (113) and (5,5,12) separate into facets of these two orientations; between (5,5,12) and (112), they separate into (5,5,12) and (111) facets. (337) facets in this range may be considered as defective (5,5,12) facets.