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In order to determine whether matrix-element effects might be responsible for the "mystery" peaks seen by Barrie and Street, 2.7 eV below threshold in the KL₁V and KL2,3V Auger spectra of Na, we have calculated these spectra within a one-orthogonalized-plane-wave, independent-electron picture. We present here a description of the calculation as well as our results which indicate that matrix elements cannot explain these peaks.
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Feibelman et al. (1977) studied this question.
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