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Title: Electron transmission spectroscopy of some inorganic and organic molecules
Author: Kadifachi, Sadiq Hussein.
ISNI:       0000 0001 3593 790X
Awarding Body: Birkbeck (University of London)
Current Institution: Birkbeck (University of London)
Date of Award: 2003
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An electron spectrometer was built in our laboratory to study the interaction of low energy ( 0.3 to 10 eV ) electrons with neutral molecules. The helium resonance at 19.3 eV was used to determine the energy resolution of the electron beam, and the 2.1 eV molecular nitrogen resonance to calibrate the energy scale of the incident electron beam. Total absolute cross sections were measured for the following molecules: molecular nitrogen, carbon monoxide, carbon dioxide, sulphur dioxide; also recorded was their electron affinity and resonant vibrational levels arising from temporary formation of negative ion states. Relative cross sections , resonant vibrational structures and electron affinities were determined for the following molecules: benzene, furan, pyrrole; ethylene, propene, butene, pentene, hexene; cyclopentene, cyclohexene, cycloheptene, cyclooctene. Comparison between these measurements and the most recent theoretical calculations and experimental data of other laboratories are presented. The spectrometer was modified by incorporating a manometer for the purpose of making accurate pressure measurements inside the collision chamber and interfaced with a new computer containing the appropriate software to calculate the electron cross section of molecules in the gas phase. Also measured, for the first time in our laboratory, the absolute total electron cross sections of N2, CO, CO2 and SO2, the latter never having been measured before anywhere. The electron beam resolution was improved by incorporating into the spectrometer an additional 1270 momentum cylindrical selector in tandem with the existing monochromator but having separate controls. The previously published results of C6H6, N2, C2H4, were remeasured and inaccuracies were discovered in this data. In addition, the electron affinities of a complete series of related compounds-: linear and cyclic alkenes - were measuredf or the first time and to the best of the author's knowledge the results are original and do not appear elsewhere.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available