Abstract
The (0 0 1) and (1 1 1) surfaces of PbTe have been observed by high-resolution Rutherford backscattering spectroscopy (HRBS) and reflection high-energy electron diffraction (RHEED). The observed HRBS spectra for the incidence of 300–350 keV He + ions show several peaks corresponding to individual atomic layers, allowing direct determination of atomic concentrations for each layer. While the (0 0 1) surface is stoichiometric up to the topmost atomic layer, the (1 1 1) surface is terminated by the Pb layer and the density of the topmost Pb layer is about 30% of the bulk density.
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