Auger photoelectron coincidence spectroscopy

Abstract

The principles behind Auger electron spectroscopy (AES) and X-ray photo emission spectroscopy (XPS) are briefly reviewed. The advantages of performing coincidence spectroscopy with surface analytical techniques is outlined. The principle of reducing the complexity of the spectra with APECS is illustrated by examining the APECS data collected on the L_2,3VV transitions of Cobalt. Here the spectra are highly modified by the presence of an additional valence band hole in coincidence with the 2p_1/2 photoelectron.
The ability of APECS to find the origin of satellites is also explored with reference to the L₂VV satellite in Cu. Here the APECS experiment confirms that the origin of the satellite is in part due to the L₁L₂V Coster-Kronig process.