Abstract
Abstract After very brief historical notes, the basis of the TOF-PEPECO technique is explained and other techniques for spectra of doubly charged positive ions are described and compared with this modern method. The meaning of ionisation energies in the context of molecular double ionisation is discussed, with their relationship to electron orbital configurations. With the advent of photoelectron spectroscopy in the 1960s, new techniques allowed complete spectra of valence electron ionisations for each molecule to be revealed in a single measurement. The effects on the spectra of the different major pathways from starting molecules to final doubly ionised states are explained. Details of the experiments are given, including pulsed lamps, synchrotron radiation as light sources, and the magnetic bottle time-of-flight electron spectrometer.
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