Time-symmetric shaped pulses for spin-1 excitation
| dc.contributor.author | Habot, Simon | |
| dc.contributor.author | University of Lethbridge. Faculty of Arts and Science | |
| dc.contributor.supervisor | Siminovitch, David | |
| dc.date.accessioned | 2007-04-20T20:49:15Z | |
| dc.date.available | 2007-04-20T20:49:15Z | |
| dc.date.issued | 1998 | |
| dc.degree.level | Masters | |
| 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.identifier.uri | https://hdl.handle.net/10133/71 | |
| dc.language.iso | en_US | en |
| dc.publisher | Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 1998 | en |
| dc.publisher.department | Department of Physics | |
| dc.publisher.faculty | Arts and Science | |
| 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 |