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Title: Photo-dissociation of ions in a mass spectrometer using laser radiation
Author: Griffiths, I. W.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1981
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In this thesis, the results of an investigation of the photodissociation of various gas-phase cation species are presented and discussed. The fundamental process can be represented by m1 + by - m1 - m2 + m3 + T , where m+ is the reactant ion of mass ml to be photodissociated, 4+ and m3 are the product ion and neutral of masses m and m3 respectively and T is the amount of energy released as translational motion. The molecular species chosen for study were polyatomics, usually with five or more atoms. The light quanta used were derived from laser sources and were in the visible and ultraviolet range. The emphasis of the work has been on measurements of the translational energy release, T, and on the comparison of photodissociation with collision-induced dissociation. Cross-sections for photodissociation have also been investigated for a limited number of ions. The mass spectrometers employed in this work utilised ion beams with initial translational energies of a few keV and gave extremely good energy resolving power in ion kinetic energy spectra (typically 103-104). Previously, only very simple ion species had been investigated with such high resolving power. This meant that very accurate values of T could be measured for the systems studied. The technique is seen as a powerful analytical tool to be used as a complement to normal mass spectrometry; thus compounds with very closely similar mass spectra may be differentiated by the use of the photodissociation technique.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available