Calibration procedures to study molecular fragmentation by electron–ion coincidences

Calibration procedures are presented for an apparatus in which an electron spectrometer is combined with an ion time-of-flight spectrometer. We analyze the properties of the system for fragmentation studies of doubly-charged diatomic molecules where Auger electrons and ionic fragments are detected in coincidence. Special emphasis is given to the extraction of fragment ion yields from the experimental data and to the measurement of the kinetic energy release. The influence of instrumental parameters and of possible angular distribution effects on the results of such measurements is discussed.