Many-electron contributions in the auger spectrum of CO

The CO Auger electron spectrum has been re-investigated by means of ab initio MO LCAO calculations using a combined SCF CI procedure. The CI comprises internal and semi-internal contributions to the final double-hole Slate wave-functions. In particular, the latter contributions are found to be highly significant both with respect to energies and intensities of the Auger transitions. In order to compare with the experimental spectra, the intensities of the transitions have also been calculated using a simple one-center model.