A detailed low-energy electron diffraction study of the clean Si(100)(2 x 1) surface and the effects of hydrogen adsorption was made. Adsorption of hydrogen in the presence of a hot filament modifies the structure to give a sharp (1 x 1) low-energy electron diffraction pattern, and the intensity data were consistent with the structure of the silicon atoms being in the bulk structure sites. This observation was in conflict with the only previously reported study of hydrogen adsorption using low-energy electron diffraction, and favours certain models for the (2 x 1) reconstructed surface which have been discarded as incompatible with the earlier experimental result of Ibach & Rowe (1974).

Surface Reconstruction of Si(100) and the Effect of Hydrogen Absorption. S.J.White, D.P.Woodruff: Journal of Physics C, 1976, 9[17], L451-3