Surface structure and long-range order of the Ge(111)-c(2×8) reconstruction
- 15 November 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 38 (14), 9715-9720
- https://doi.org/10.1103/physrevb.38.9715
Abstract
We have performed an x-ray diffraction study of the Ge(111)-c(2×8) surface. From the analysis of 43 in-plane, symmetry-inequivalent structure factors, a simple adatom model with subsurface relaxation is deduced. The relaxations around the adatoms are similar to those observed in the adatom complexes on Si(111)-(7×7) and Sn/Ge(111)-(√3 × √3 ), -(5×5), and -(7×7), suggesting that the adatoms are located in threefold sites above the second-layer atoms ( sites). Significant distortions around the rest atoms are seen due to rehybridization of the dangling bonds. The diffraction peaks from the eighth-order reflections are displaced away from their nominal positions. This is explained by a model where the long-range order of the c(2×8) structure is disturbed by faults due to rows of 2×2 unit cells.
Keywords
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