AUGER-PHOTOELECTRON COINCIDENCE SPECTROSCOPY USING SYNCHRONTRON RADIATION

The technique of Auger-photoelectron coincidence spectroscopy (APECS) is described and illustrated with a case study of the Cu(100) 3p and M (23)VV spectra. APECS offers many advantages over the conventional sin gles spectroscopy such as isolating overlapping spectral features, red ucing secondary electron background, and revealing new decay modes. In the coincidence Cu Auger spectra discussed here, the multiplet struct ure of the quasi-atomic 3d(8) Auger final state is clearly observed, a s well as different intensities for the multiplet components for the p (1/2) and p(3/2) transitions. Furthermore, the spectra reveal evidence for a Coster-Kronig decay channel for 3p(1/2) core holes, and illustr ate that the sum of the Auger electron and photoelectron kinetic energ ies is conserved. Possible technical improvements that can increase th e counting efficiency are also discussed.