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http://hdl.handle.net/11375/6466
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DC Field | Value | Language |
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dc.contributor.advisor | Hitchcock, Adam P. | en_US |
dc.contributor.author | Francis, James T. | en_US |
dc.date.accessioned | 2014-06-18T16:35:30Z | - |
dc.date.available | 2014-06-18T16:35:30Z | - |
dc.date.created | 2010-06-18 | en_US |
dc.date.issued | 1995 | en_US |
dc.identifier.other | opendissertations/1778 | en_US |
dc.identifier.other | 3123 | en_US |
dc.identifier.other | 1362849 | en_US |
dc.identifier.uri | http://hdl.handle.net/11375/6466 | - |
dc.description.abstract | <p>In contrast to photoabsorption techniques, which are subject to electric dipole selection rules, electron energy loss spectroscopy (EELS) can provide a more complete investigation of atomic and molecular electronic structure. This is due to the added capability of accessing dipole and/or spin forbidden electronic transitions under conditions of significant momentum transfer.</p> <p>This work documents the design, construction and performance of a new, high resolution, variable scattering angle, variable impact energy electron spectrometer (McVAHRES) which has been used to investigate electronic transitions in gas phase atoms and molecules under both dipole and non-dipole conditions. The home-built instrument features a complex electron optics system and a sophisticated, computer-interfaced electronics system which allows a high degree of flexibility with regards to control and acquisition. This permits a wide range of experimental conditions.</p> <p>New spectroscopic studies include the observation of spin-forbidden, C is core excited triplet states in C₂H₄, C₂H₂, and C₆H₆. The momentum transfer dependence of the (C 1sˉ¹, π*) ³π state of CO was also investigated. These results are compared to the results of theoretical calculations. Generalised Oscillator Strengths (GOS) as a function of momentum transfer were derived for the S 2p edge of SF6. This work greatly expands previous results reported in the literature. Finally, an interesting feature was observed in the S 2p spectrum of SF₆, which displays quadrupolar momentum transfer behaviour.</p> | en_US |
dc.subject | Chemistry | en_US |
dc.subject | Chemistry | en_US |
dc.title | Non-Dipole and Dipole Core Electronic Excitation | en_US |
dc.type | thesis | en_US |
dc.contributor.department | Chemistry | en_US |
dc.description.degree | Doctor of Philosophy (PhD) | en_US |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Size | Format | |
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fulltext.pdf | 4.48 MB | Adobe PDF | View/Open |
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