The electronic state of ferromagnetic Ni and the expected magnetic circular dichroism (MCD) in Ni 2p{→}3d x-ray-absorption spectroscopy [2p (XAS)] are discussed from a viewpoint of 3d configuration interaction on the basis of the Anderson impurity model. The model includes multiplet effects arising from 3d-3d and 3d-2p electron interactions and a 3d interatomic exchange approximated by a molecular field acting on the 3d spin. By using commonly accepted values of the interaction strengths, it is shown that the ground state of a Ni atom in ferromagnetic Ni is expressed by a superposition of 3d¹⁰, 3d⁹, and 3d⁸ configurations with relative weights of 15%--20%, 60%--70%, and 15%--20%, respectively, and with an orbital-magnetic-moment contribution of {~}0.07μB to the total moment of 0.6μB. With these results, we can explain the recently observed MCD in Ni 2p XAS.
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Jo et al. (1991) studied this question.