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Appearance potential spectra from Ni/Cu alloys reveal that in no case do d holes enter the sites of Cu atoms, but on the other hand that d holes at Ni sites exist even at Cu contents of more than 55%. The derived densities of states at the Fermi level are in very good agreement with results of Stocks, Williams, and Faulkner, calculated on the basis of the coherent potential approximation.
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Ertl et al. (1972) studied this question.
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