Ordered-defect model for Si(001)-(2×8)

Abstract
The atomic arrangement of the Si(001)-(2×8) surface, which is obtained by annealing at high temperatures, is discussed. Both the analysis of strong features in low-energy electron diffraction patterns and considerations about the surface strain energy favor the ordered missing-dimer defect model. The role of a trace of nickel impurity, which has been reported to stabilize the (2×8) structure, is also discussed.