Raman spectroscopy of surface phonons on Sb-terminated Si 001/

We study the surface structure of Sb-terminated singular on-axis.and vicinal 48 offcut inw110x. Si 001. by Raman spectroscopy RS.. In the Raman spectra three surface phonons with A1-symmetry are identified at 80 cmy1, 130.5 cmy1 and 162 cmy1. The polarisation dependent Raman scattering intensities for the singular and vicinal samples are found to be correlated with the different surface reconstructions. After deposition of Sb at 2608C and further annealing to 4008C and 6008C, a nearly balanced ratio of 2=1.: 1=2.domains for the singular sample and a predominantly 2=1.reconstructed surface for the vicinal sample is derived from RS, in agreement with LEED results. In contrast, after Sb deposition at 6008C, a balanced ratio of 2=1.and 1=2.reconstructed domains is found for vicinal as well as for singular Si 001.. q2000 Elsevier Science B.V. All rights reserved.