Abstract

Modern storage rings providing synchrotron radiation of high brightness have made it possible to study atomic systems in greater detail. One type of experimental technique that has taken advantage of the progress in storage-ring instrumentation is coincidence spectroscopy. Electron time-of-flight (TOF) spectrometers which utilize the time structure of the electron bunches in the storage ring are particularly well-suited to study simultaneous double-ionization processes due to their ability to detect electrons of all kinetic energies simultaneously within a certain acceptance angle. Employing three TOF spectrometers at different angles we have studied electron-electron coincidences originating from double-ionization processes in helium. First results using this technique will be presented and discussed.

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