Alpha-Gallium (010) surface reconstruction: a LEED structural analysis of the (1x1) room temperature and (2rt2xrt2)R45 degrees low temperature structures
- LBNL Library
The geometric structure of the alpha-Ga(010)-(1x1) room temperature structure and its (2rt2xrt2) R45 degrees reconstruction below 232 K have been determined using Low Energy Electron Diffraction (LEED) structure analysis. The room temperature structure conforms to the cut-dimer model, forming a two-dimensional metallic structure with only minimal lateral displacements of the atoms. The topmost interlayer distance is 1.53 Angstrom, corresponding to a spacing expansion of 2 percent from the bulk. In the low-temperature structure, the surface atoms shift to dimerize within the top two layers, resulting in a network of mostly covalent bonds, which form both parallel and perpendicular to the surface plane. The bond lengths of some of these dimers are about 10 percent shorter than the bond length found in the alpha-Ga bulk and are thus shorter than any Ga-Ga bonds reported so far.
- Research Organization:
- Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 821034
- Report Number(s):
- LBNL--52338
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 7 Vol. 68
- Country of Publication:
- United States
- Language:
- English
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