THE VIBRATIONALLY RESOLVED PARTICIPATOR AUGER-SPECTRA OF SELECTIVELY EXCITED C-1S(2-SIGMA(-1))2-PI(1) VIBRATIONAL-STATES IN CARBON-MONOXIDE

The fully vibrationally resolved participator Auger spectra originating from the decay of the C 1s(2σ)-12π1 resonance in CO are presented. The C 1s(2σ)-12π1 v′=0 resonance has been excited with a 75 meV monochromator bandpass, i.e., in Auger resonant Raman conditions, and the participator Auger spectrum observed. The C 1s(2σ)-12π1 v′=1 resonance is also excited and the corresponding participator Auger spectrum observed with a monochromator bandpass 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 1s photoelectron 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(2σ)-12π1 resonance is measured to have a width of 86(10) meV. © 1995 American Institute of Physics.