Abstract
A scanning tunneling microscope has been used to study the Si(111)-3×1-Ag surface. The 3×1-Ag surface has been observed to consist of a bright row and small protrusions; the bright row points in the <1̄10> direction and the protrusions point in the <123̄> and <213̄> directions. The width of 3×1-Ag domains, nucleated on the Si-7×7 terraces, has been found to be (21n-2)a, where n is an integer (n=1, 2,···) and a is the lattice constant of Si (a=3.84 Å). Detailed investigation on domain boundaries reveals that both sides of the 3×1-Ag domain face the unfaulted halves of the 7×7 structure. Moreover, two types of domain boundaries have been observed: one which runs across the corner holes, and another is that runs apart from the corner holes, leaving a narrow 7×7 terrace of one adatom width. Possible structural models for the 3×1-Ag surface are proposed based on the present STM results.
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