Abstract
Normal-incidence isochromat spectra from Ni(001) are presented. Our results show only limited agreement with previously published data by Woodruff et al., [Phys. Rev. B 26 2943 (1982)]. The agreement with the theoretical prediction of Woodruff et al., however, is considerably improved. The discrepancy in experimental data is shown to result from carbon contamination of the nickel sample in the above paper.