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Time-symmetric shaped pulses for spin-1 excitation

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dc.contributor.advisor Siminovitch, David
dc.contributor.author Habot, Simon
dc.contributor.author University of Lethbridge. Faculty of Arts and Science
dc.date.accessioned 2007-04-20T20:49:15Z
dc.date.available 2007-04-20T20:49:15Z
dc.date.issued 1998
dc.identifier.uri http://hdl.handle.net/10133/71
dc.description xiii, 99 leaves : ill. ; 28 cm. en
dc.description.abstract Shaped pulses can be used for uniform spin-1 excitation. The effects of the pulses on spin-1 excitation is seen as distortion of two types: phase distortions and amplitude distortions. By reducing the distortions a spin-1 excitation becomes more uniform. In the case of time-symmetric shaped pulses, spin-1 excitation is free of phase distortions. The spin-1 excitation in that case can be made uniform over a larger frequency bandwidth. The number of possible shaped pulses is so large that a computer-aided search is needed to find the desirable shaped pulses. A theoretical analysis is used to find the connection between a shaped pulse and the corresponding spin-1 excitation. The theoretical analysis in density matrix formalism gives the spin-1 excitation in closed-form expressions that are too complicated. In such a case the connection between a shpaed pulse and spin-1 excitation is not straightforward. A brute-force search for a desirable shaped pulse can consume too much computer time and thus time the scope of the search. By using the formalism of quaternions in the theoretical analysis, spin-1 excitation is presented in simple closed form expressions. It is then shown tht if the choice is limited to time-symmetric shaped pulses then these closed form expressions become much simpler. It is also shown that a spin-1 excitation is free of phase distortions in that case. These simple closed form expressions can be used as the building blocks of a much more concise program code for the computer aided search. As a result a computer aided search for a desirable shaped pulse becomes much faster in speed and larger in scope. More shaped pulses for improved spin-1 can be found. en
dc.language.iso en_US en
dc.publisher Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 1998 en
dc.relation.ispartofseries Thesis (University of Lethbridge. Faculty of Arts and Science) en
dc.subject Nuclear spin en
dc.subject Nuclear magnetic resonance spectroscopy en
dc.subject Isotopes -- Spectra en
dc.subject Space and time en
dc.subject Time en
dc.subject Physics -- Philosophy en
dc.subject Dissertations, Academic en
dc.title Time-symmetric shaped pulses for spin-1 excitation en
dc.type Thesis en
dc.publisher.faculty Arts and Science
dc.publisher.department Department of Physics

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