Surface core-level shift photoelectron diffraction study of beta-SiC(001)-c(2 x 2) surface

Surface core-level shift energy scan photoelectron diffraction (PED) was us ed to distinguish the two structural models of the C-terminated beta-SiC(00 1)-c(2 x 2) surface under debate. An experimental FED curve of the surface C Is component is in good agreement only with the simulated curve of the un usual bridge dimer model denying the conventional dimer model. The optimize d structural parameters of this bridge dimer model are 1.22, 1.84 and 2.7 A ngstrom for the C-C, C-Si and Si-Si bond lengths, respectively, in agreemen t with recent theoretical calculations. (C) 1999 Elsevier Science B.V. All rights reserved.