The 3×{}1 surface reconstruction of the Si(111) surface induced by adsorption of Li is studied with scanning tunneling microscopy (STM). Both filled- and empty-state STM images show arrays of atomic scale features with a 3×{}1 periodicity, but with different distributions of maxima within the unit cell. There are strong similarities with images of the Ag-induced 3×{}1 structure. STM images from both systems are compared with each other and discussed in terms of recent proposals that the metal atoms do not participate directly in the 3×{}1 long-range order.
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Wan et al. (1992) studied this question.
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