Multilayer relaxation on clean Pb{111} has been determined by analysis of low-energy electron diffraction intensity data collected from a sample at -140 °C. The first interlayer spacing is compressed from the bulk value (2.844 Å) by (3.5±1)%, the second interlayer spacing is expanded by (0.5±1.4)%, and the third interlayer spacing is expanded by (1.6±1.8)%. These results are consistent with the observations made on Pb{110} and Pb{001} that Pb surfaces exhibit structure relaxations markedly larger than on surfaces of other fcc metals investigated to date.

• Received 7 November 1990

DOI:https://doi.org/10.1103/PhysRevB.43.6337