We present a mechanism for the resonance near the $3p$ threshold in the photoemission associated with the two-hole bound state in metals such as Cu and Zn. It is based upon the strong interaction between the 4s-4p conduction-band electrons and the two bound holes (the 3d⁸ configuration) resulting from the super Coster-Kronig decay of the $3p$ core hole. This effect also occurs in Ni but is not dominant.
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Davis et al. (1980) studied this question.
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