DETERMINATION OF A CU(110) SURFACE CONTRACTION BY LEED INTENSITY ANALYSIS

Normal incidence LEED intensity spectra from six symmetrically inequivalent diffraction beams from a clean Cu(110) surface are presented and analyzed. The analysis has employed the results of two distinct sets of dynamical LEED calculations, which differ only in the choice of the electron scattering potential. It is indicated by the analysis that the Cu(110) surface region is in lateral registry with the truncated bulk, the first atomic layer is contracted toward the second by 10.0 ± 2.5% relative to the bulk spacing, and the second to third layer spacing is within 2.5% of the bulk value. A discrepancy of unknown origin has been found between the experimental and calculated I-V proflies for three beams in the 60 eV region; however, this discrepancy does not appear to affect the crystallographic conclusions of the analysis. © 1979.