Both (1 x 3) and (√3 x √3)R30° reconstructions of the Si(111) surface induced by Li, K and Cs depositions were studied by low energy electron diffraction and Auger electron spectroscopy. It was found that measured low-energy electron diffraction I-V curves for (1 x 3) reconstruction induced by different alkali metals were virtually identical to each other, which suggests that the (1 x 3) structures of the Si(111) reconstruction induced by different alkali metals were nearly identical. Work-function measurements indicating alkali-metal coverages of near 0.1ML for the (1 x 3) structures, excluded the possibility of long-range ordered structures of Li in the (1 x 3) reconstruction. The measured I-V curves of the Li-induced (√3 x √3)R30° reconstruction were similar to those of Ag-induced (√3 x √3)R30° structures, indicating similarity between the (√3 x √3) structures.

Reconstruction of the Si(111) Surface Induced by Alkali Metals. W.C.Fan, A.Ignatiev: Surface Science, 1993, 296[3], 352-7