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Title: Dielectronic recombination in highly charged ions
Author: Kavanagh, Anthony
ISNI:       0000 0001 3595 6748
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2007
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Dielectronicrecombination resonance strengths for the KLL and KLM manifolds were measured for various ions. The He-like, Li-Iike and Be-like charge states of Iron, Yttrium and Holmium were measured. As were the He-like to C-Iike ions of Iodine and Bismuth. The ion charge states were created and maintained in the Tokyo electron beam ion trap. The charge balance was inferred from axially escaping ions. The electron beam energy was slowly scanned across dielectronic recombination manifolds ensuring charge state equilibrium was maintained. The ratio of adjacent ion charge states was then plotted against the beam energy. The ratio was first corrected for variations in charge exchange and escape rates and then a non-resonant background was removed leaving only the resonant contribution. By normalizing the resultant ratio to theoretical electron impact ionization cross sections and integrating the line shape, the resonance strengths were obtained. The obtained resonance strengths agree well with theoretical calculations and allowed the generation of Z scaling laws for He-like, Li-Iike and Be-like ions in the KLL and KLM manifolds. A simple isonuclear scaling was also generated for KLL and KLM although further testing is required for confidence in this last scaling law.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available