Results of an international leed intensity project: I. Reproducibility of experimental spectra

Abstract

Five laboratories participated in a project consisting in the collection of LEED (low-energy electron diffraction) data from a self-prepared Cu{001} surface for the purpose of testing methodologies and reproducibility. Each of the five data sets consists of normal-incidence I–V spectra for the four degenerate 10-, 11- and 20-type beams and for some of the eight degenerate 21-type beams, the electron energy varying in the range from 20 to 300 eV somewhat differently in different sets. Although equivalent I–V curves look very similar to one another a quantitative analysis reveals that the energy scale may be shifted by as much as 10 eV from laboratory to laboratory, the peak positions may fluctuate by ±2.5 eV and the peak intensities may vary by as much as 70%.