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Abstract

Angle-resolved resonant electron spectra following vibrationally resolved C 1s → nlλ(v= 0,1) excitations in CO have been measured. The observed groups of resonant Auger linesexhibit great similarity in shape to the C-KVV group of non-resonant Auger lines and the observedangular distribution behaviour reflects the symmetry-dependent anisotropies of the excitationprocess. The molecular progressions in the C 1s → π* resonant Auger spectrum could be clearlyidentified due to their different angular distribution behaviour. Furthermore, it could be shownthat the screening energies for spectator electrons over binding energy have a linear dependencebetween 3pπ,4pπ and threshold as was expected for the higher p-symmetry Rydberg orbitals.