Recently, Giessibl et al. (1) reported a distinct substructure in atomic force microscopy (AFM) images of individual adatoms on the Si(111)-(7×7) surface. A cross section along the fast scanning direction showed two peaks per adatom, which were interpreted as images of two unsaturated dangling bonds at the apex of the silicon tip interacting with the dangling bond of the adatom.
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Hug et al. (2001) studied this question.
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