A REVIEW OF AUGER-PHOTOELECTRON COINCIDENCE SPECTROSCOPY

The application of coincidence detection techniques produces a dramati c increase in the information obtained from particle and photon scatte ring studies. A clear illustration of this is given by Anger Photoelec tron Coincidence Spectroscopy (APECS), By coincident detection of the ejected photoelectron and the resulting Auger electron during x-ray ex cited Auger spectroscopy, it is possible to distinguish the true origi n of peaks and satellites within the Auger spectra. For example, it be comes possible to separate standard Auger processes from those occurri ng in conjunction with Coster-Kronig transitions and from those either followed or preceded by shake-off or shake-up transitions. In additio n, the technique often allows the separation of overlapping series of Auger peaks, thus permitting the study of individual elements within c ompounds and alloys, These possibilities will be illustrated primarily by reference to APECS studies of 3d transition metal elements.