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Title: Dynamics of anions probed by photoelectron imaging
Author: Stanley, Laurence Harry
ISNI:       0000 0004 6497 252X
Awarding Body: Durham University
Current Institution: Durham University
Date of Award: 2017
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This work comprises of the design and construction of a novel ion trap and guide system for the existing photoelectron spectrometer along with the study of two molecular systems. The redesigning of the system was to address shortcomings in the previous design and to open the door to new possibilities of research. The new components have been installed and proof-of-concept data has been taken that shows the success of the new cryogenic cooling system upon the ions. The anionic resonances of anthracene, a polyaromatic hydrocarbon (PAH), were studied using the new apparatus. This allowed for the use of a new methodology to produce ions of interest that were previously impossible to study. While we found that photodissociation gave better regioselectivity, it was possible to generate the most stable deprotonated from of the anthracenyl anion. Considering the formation of the anions in the interstellar medium, it was shown that it is likely that the anthracenyl resonances preferred to decay by autodetachment. This would result in little formation of the anion from the approach of an electron upon the neutral. The chromophore of the Green Fluorescent Protein (GFP) has been extensively studied by other researchers. We investigated the dynamics of an isomer of that chromophore. The movement of a single functional group from the para- to the meta- position completely alters the energetics of the system along with the dynamics. It was shown that this structural change would make for a significantly poorer choice as a chromophore for a fluorescent protein.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available