| Summary: | Dissociations of C2F62+, SiCl42+, C2H22+, CC > 22+ and H2O2+. Estimates of the dication precursor state energies for forming ion pairs are derived, and are shown to be in good agreement with existing experimental and theoretical data. The measurements presented in this thesis include the first estimates of the electronic state energies of the C2F62+ and SiCU2+ dications. A breakdown scheme for C2H22+ is derived, which in combination with the relative PICS for ion pair formation, yields branching ratios for primary two-body charge separating dissociation. Comparison of this scheme with recent theoretical calculations suggests that below 75 eV, C2H22+ dissociates predominantly on the ground triplet potential energy surface (3 g). By contrast, the dissociations of the C2F62+ dication are postulated to be predominantly impulsive in nature, for which fast-sequential decay mechanisms are proposed for forming ion pairs.
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