COINCIDENCE EXPERIMENTS FOLLOWING SYNCHROTRON-RADIATION EXCITATION

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