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We determine the exchange splitting in ferromagnetic Ni by means of angle-resolved photoemission from a (111) surface. The optical selection rules arising from use of the (11̄0) mirror plane of detection are used to identify the contributions from the majority- and minority-spin sub-bands. The splitting at the top of the d bands turns out to be about 0.5 eV at the point (0.14, -0.43, -0.43)2πa, in good agreement with a recent self-consistent band-structure calculation by Wang and Callaway based on the exchange potential of von Barth and Hedin.
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Dietz et al. (1978) studied this question.
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