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A peak observed in the soft X-ray emission intensity of an Fe 8 at.% Al alloy lies some 8 eV below the Fermi edge, near the bottom of the Fe 3d-4s bands. There is no such peak in the spectrum for pure Fe, nor has a similar feature been observed with Ni-Al alloys. Al therefore is a strong perturbation in Fe, giving rise to a (virtual) bound state, and it is concluded that the 3d Fe electrons are ineffective in screening an Al impurity, in sharp contrast to Ni.
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Sayers et al. (1975) studied this question.
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