AUGER-ELECTRON PEAKS OF CU IN XPS

Intensities of photoelectron and photo-excited Auger electron peaks ob served in X-ray photoelectron spectroscopy of copper have been analyze d using a background optimization formalism. The relative intensities of L(2,3)MM peaks are proportional to those predicted by Auger transit ion probabilities. However, their absolute intensities are stronger th an those of holes created by 2p photoemission. Measurement by monochro matic X-ray photoelectron spectroscopy indicates that there is a contr ibution from a 2s hole by Coster-Kronig transition. Moreover, a spectr um of a conventional (non-monochromatic) source suggests additional 2s and 2p holes by the accompanying Bremsstrahlung.