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Vogler, H.; Iglesias, A.; Moritz, Wolfgang; Over, Herbert (1998): Ge(113) reconstruction stabilized by subsurface interstitials: An x-ray diffraction structure analysis. In: Physical Review B - Condensed Matter and Materials Physics, Vol. 57, No. 4: pp. 2315-2320
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The three-dimensional atomic coordinates of the Ge(113)-(3×1) surface have been determined by analyzing in-plane and out-of-plane x-ray intensity data. Besides dimer and adatom motifs, which reduce the number of dangling bonds, a random distribution of subsurface interstitials has been identified. Subsurface interstitials relieve elastic stress and lower the energy of the electronic system. Together with the delicate balance between the energy gain due to reduction of dangling bonds and the energy costs due to induced strain this determines the nature of the (3×1) reconstruction of Ge(113).