Abstract
The concave surface of mechanochemically treated Si(111) samples breaks up, under UHV treatment, into a large number of vicinal Si(111) surfaces. The concave surface presents a continuous range of polar angles up to 10° for arbitrary azimuthal direction. Scanning tunneling microscopy (STM) measurements, performed on different parts of the surface, have shown facetting into (111)-oriented, 7 × 7 reconstructed terraces, steps or step bunches. Characteristic step arrangements known from individually prepared vicinal Si(111) surfaces have been identified. On step bunches ordered regions with orientations corresponding to high-index ( hkl) values have been observed. One of these could be assigned to a (9 13 7) facet and is decribed in the present work.
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