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In this work, we present the CoESCA station for electron-electron coincidencespectroscopy from surfaces, built in a close collaboration between UppsalaUniversity and Helmholtz-Zentrum Berlin at the BESSY II synchrotron facility inBerlin, Germany. We start with a detailed overview of previous work in thefield of electron-electron coincidences, before we describe the CoESCA setupand its design parameters. The system is capable of recording shot-to-shotresolved 6D coincidence datasets, i.e. the kinetic energy and the two take offangles for both coincident electrons. The mathematics behind extracting andanalysing these multi-dimensional coincidence datasets is introduced, with afocus on coincidence statistics, resulting in fundamental limits of thesignal-to-noise ratio and its implications for acquisition times and the sizeof the raw data stream. The functionality of the CoESCA station is demonstratedfor the example of Auger electron - photoelectron coincidences from silversurfaces for photoelectrons from the Ag 3d core levels and their correspondingMNN Auger electrons. The Auger spectra originating from the different corelevels, 3d$_{3/2}$ and 3d$_{5/2}$ could be separated and further, the two-holestate energy distributions were determined for these Auger decay channels.

The CoESCA station at BESSY: Auger electron-Photoelectron coincidences from surfaces demonstrated for Ag MNN