Interpretation of M V V and L2,3 V V Auger spectra of Co

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Abstract
The MVV and L2,3 VV Auger spectra of Co have been acquired from a clean polycrystalline foil and the intrinsic line shapes determined using standard deconvolution procedures. The line shapes are observed to be broad and band-like and do not exhibit any narrow atomic-like features as previously observed for Cu. The energies of the peak positions of the Co Auger lines might be interpreted as indicating hole–hole interaction energies (Ueff ) of ∠4.5 eV for the MVV and ∠2 eV for the L2,3 VV transitions, respectively. These values are inconsistent with the expected trend of decreasing Ueff in going from Cu to Co and with the fact that Ueff , a final state property, should be the same for all core–valence–valence decays. An alternative explanation is that the energy shifts are related to initial state screening and/or matrix element effects. These effects, as well as the differing lifetimes of each initial core hole, may also contribute to the larger FWHM of the measured spectra as compared to that obtained by self-folding a calculated DOS. The interpretation of these spectra and a comparison with similar data for Cu are discussed.

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