Multilayer relaxation of a Pb{111} surface.

Abstract

Multilayer relaxation on clean Pb{111} has been determined by analysis of low-energy electron diffraction intensity data collected from a sample at -140 \ifmmode^\circ\else\textdegree\fi{}C. The first interlayer spacing is compressed from the bulk value (2.844 \AA{}) by (3.5\ifmmode\pm\else\textpm\fi{}1)%, the second interlayer spacing is expanded by (0.5\ifmmode\pm\else\textpm\fi{}1.4)%, and the third interlayer spacing is expanded by (1.6\ifmmode\pm\else\textpm\fi{}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.