Abstract
We present new results obtained with medium energy ion beam crystallography on the clean Si (100)−(2 × 1) surface. This study, meant to discriminate between symmetric and asymmetric dimer models for the reconstruction, shows that symmetric dimers are not consistent with our results. We conclude that the Si (100)−(2 × 1) surface is reconstructed in asymmetric dimers, accompanied by extensive subsurface distortions.
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