The vibrationally resolved participator Auger spectra of selectively excited C 1s(2sigma)-12pi1 vibrational states in carbon monoxide

The fully vibrationally resolved participator Auger spectra originating from the decay of the C 1s(2?)-12?1resonance in CO are presented. The C 1s(2?)-12?1 v'=0 resonance has been excited with a 75 meV monochromatorbandpass, i.e., in Auger resonant Raman conditions, and the participator Auger spectrum observed. The C 1s(2?)-12?1 v'=1 resonance is also excited and the corresponding participator Auger spectrum observed with a monochromatorbandpass slightly larger than the inherent width. The results are compared to theoretical simulations using coherent lifetime-vibrational interference theory which accounts for the details of the spectrum. We have observed an interference shift on the transitions to different vibrational sublevels in the final state. A high resolution C 1sphotoelectron spectrum of CO is also presented. The lifetime width of the C 1s core-hole state is determined to be 97(10) meV, whereas the C 1s(2?)-12?1resonance is measured to have a width of 86(10) meV.