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We have performed spin-polarized angle- and energy-resolved photoemission measurements on Ni (001) with polarized He I radiation (h=21. 22 eV). The energy-distribution curves show a shoulder which has been interpreted heretofore as a {}₅ majority-spin surface state. This surface state was assumed to determine the spin polarization of earlier photoyield measurements near threshold. Our spin-resolved measurements demonstrate, however, that this structure is due to minority-spin emission in contradiction to the earlier assignment. Investigations of the light-polarization dependence, as well as of small deviations from normal-emission conditions in conjunction with photoemission calculations, show that the main contributions to the observed structure are due to off-normal emission from the ₂ band. It is concluded that contributions from surface structures can only be of minor importance.
Clauberg et al. (1984) studied this question.