The capability of the recently observed dichroic effect in angle-resolved Auger-photoelectron coincidence spectroscopy (DEAR-APECS) to disentangle individual multiplet terms has been exploited to study the lineshape of the M(3)M(45)M(45) Auger spectrum measured in coincidence with the 3p(3/2) photoelectrons from the Cu(111) surface. The relevant multiplet structure of the two hole final state is determined with an unprecedented sensitivity, including a reliable experimental estimation of the energy of the (1)D multiplet term. Spectroscopic data for the 3p photoemission feature are also given and energy conservation applied to the photoelectron-Auger-electron pair has been successfully used in order to quantitatively explain energy shifts in coincidence spectra. Multiple-scattering calculations prove that the DEAR-APECS effect is not destroyed by diffraction effects and a simple model which combines atomic angular distributions and electron-diffraction modulations is provided in order to obtain a detailed understanding of the multiplet energy and intensity distributions in Auger spectra.
Gotter, R., Da Pieve, F., Offi, F., Ruocco, A., Verdini, A., Yao, H., et al. (2009). M(3)M(45)M(45) Auger lineshape measured from the Cu(111) surface: Multiplet term selectivity in angle-resolved Auger-photoelectron coincidence spectroscopy RID G-2497-2011 RID G-7348-2011. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 79(7) [10.1103/PhysRevB.79.075108].