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UBC Theses and Dissertations

Ionization and dissociation of molecules by electron impact Yu, Mina Theresa Tung-Fai


A series of related alkyl and perfluoromethyl sulphides and disulphides has been studied by electron impact. The trend in the ionization potentials shows that when the bonding electrons are drawn further away from the sulphur atom(s), as in the case of the perfluoromethyl compounds, more energy is required to ionize the molecule. From the appearance potentials and subsidiary thermochemical data, the upper limits of all the heats of formation of the non-cyclic compounds were derived. The upper limits of the heats of formation of the principal fragment ions and radicals were also calculated. From the derived heats of formation, estimates of all the C-S and S-S bond strengths were made.

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