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dc.contributor.authorDickinson, Cameron Scott.en_US
dc.date.accessioned2014-10-21T12:38:56Z
dc.date.available2014-10-21T12:38:56Z
dc.date.issued2003en_US
dc.identifier.otherAAINQ83704en_US
dc.identifier.urihttp://hdl.handle.net/10222/55928
dc.descriptionHigh resolution laser excitation spectra of the 2--1, 3--2 and 4--3 bands of the A2pi ← X2Sigma+ system of 88Sr 79Br and 88Sr81Br have been recorded. Observed perturbations in the upsilonA = 3 and 4 levels of the A2pi1/2 sub-state are confirmed to be caused by level crossings with the upsilon B = 0 and 1 levels of the B2Sigma + state. A least squares fit of all known electronic data of both the A2pi ← X 2Sigma+ and B2Sigma + ← X2Sigma+ systems was employed to simultaneously characterize the upsilon A = upsilonB + 3 level crossings, as well as the 2pi ∼ 2Sigma+ interactions, responsible for Λ-doubling in the 2pi state and "spin-rotation" splitting in the 2Sigma + state. An unobserved level crossing is predicted to occur between levels of e parity of upsilonB = 2 and upsilonA = 5.en_US
dc.descriptionThe pure rotational spectra of low-lying upsilon = 0 and 1 vibrational levels of the 2Sigma+ ground states of several isotopomers of YbF, YbCl and YbBr were recorded using a pulsed jet cavity Fourier transform microwave spectrometer. Through least squares fits, parameters describing rotational, fine and hyperfine effects (such as Fermi-contact, dipole-dipole coupling and nuclear spin-rotation coupling) are presented.en_US
dc.descriptionThe upsilon = 0 and 1 vibrational levels of the B 2Sigma+ state of YbBr were characterized for the first time through a high resolution laser investigation of rotational transitions in several bands of the B2Sigma+ ← X2Sigma+ system. The spectra were found to be highly congested, owing to the multitude of isotopomers with similar rotational Bupsilon values, which made assignment of rotational structure difficult. The effects of electronic field shifts were observed as small differences between calculated and observed isotope shifts of 174YbBr and 172YbBr isotopomers. This field shift has been observed in only a few heavy molecules, and its effect on electronic, vibrational and rotational parameters is discussed.en_US
dc.descriptionFinally, an absorption study of the A2pi ← X2Sigma+ system of YbBr has been made at high resolution using a laser arrangement. Similar to the B - X study, spectra of the A - X system were observed to be highly congested, making analysis challenging. Besides highly accurate estimates of the A state equilibrium bond length, comparisons with the analogous YbF and YbCl molecules are discussed.en_US
dc.descriptionThesis (Ph.D.)--Dalhousie University (Canada), 2003.en_US
dc.languageengen_US
dc.publisherDalhousie Universityen_US
dc.publisheren_US
dc.subjectChemistry, Physical.en_US
dc.titleHigh resolution spectroscopy of the low-lying states of strontium bromide, ytterbium fluoride, ytterbium chloride and ytterbium bromide radicals.en_US
dc.typetexten_US
dc.contributor.degreePh.D.en_US
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