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Title: Fragmentation of diatomic and polyatomic ions in the gas phase
Author: Proctor, C. J.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1981
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This thesis concerns the fragmentation of ions in the gas phase. Information has been obtained primarily by studying the reactions of metastable ions in the field-free regions of a mass spectrometer. In particular, consecutive reactions, in which the product ions resulting from a single step fragmentation are themselves reactive and can undergo further decomposition, have been investigated. A general introduction to the subject is presented in Chapter One; the history and theory behind mass spectrometry, as well as the instrumentation used in this thesis, is reviewed. Chapter Two shows that the commercially-available mass spectrometer used to obtain the majority of data presented in this thesis can be made capable of achieving good angular resolution, for investigating fine structure on metastable ion kinetic energy peaks, by the addition of angular collimating slits. Many examples of two step sequential reactions, each step being separated into a different field-free region, are given in Chapters Three and Four. Translational energy release measurements are used to examine the dependence of ion structure on the energy of formation. A triple sector mass spectrometer has also been used to study consecutive reactions. The advantages of this instrument over two sector spectrometers are presented in Chapter Five. The reactivity of ions from different portions of a translational energy release distribution, investigated by using consecutive reactions, is studied in Chapter Six. This chapter also shows that collision-induced fragmentation patterns are, in some cases, dependent upon precursor ion internal energy work. Finally, Chapter Seven deals with some general conclusions arising from this.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available