It was noted that a clean (100) surface exhibited various reconstructions, including c(2 x 10), c(2 x 6), and (1 x 3)/c(2 x 6); in order of decreasing surface Sb/Ga ratio. Core-level photo-emission spectroscopy and reflection high-energy electron diffraction techniques were used to study these reconstructions. The results showed that the c(2 x 6) and (1 x 3)/c(2 x 6) surfaces had significantly different stoichiometries and core-level line-shapes and were different reconstructions, rather than variations of the same c(2 x 6) surface; due to disorder. An analysis of photo-emission data that were obtained using a range of incident photon energies suggested that the c(2 x 10) surface was very Sb-rich, with more than 2 monolayers of Sb, while the c(2 x 6) surface had 1 to 2/3 of a monolayer of Sb, and the (1 x 3)/c(2 x 6) surface had about 1 to 2/3 of a monolayer of Sb plus 1/3 of a monolayer of intermixed Ga atoms.

M.T.Sieger, T.Miller, T.C.Chiang: Physical Review B, 1995, 52[11], 8256-65