The most suitable technique to study both direct double ionization and the one generated through the formation of a core hole and its non-radiative decay with the emission of an Auger electron consists in the detection in coincidence of two electrons selected in energy and angle. These processes are characterized by very low cross sections, therefore a multi-channel approach in energy and/or angle is mandatory. To this purpose, an experimental station equipped with ten hemispherical electron analyzers, which allows the simultaneous detection of 21 electron pairs, has been built and is in operation at the Gasphase line.
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