Multipulse nuclear magnetic resonance of liquid crystals
Multipulse nuclear magnetic resonance of liquid crystals
In this work a number of multipulse N.M.R. techniques are applied to the problem of interpreting the N.M.R. spectra of partially ordered phases and their usefulness is investigated. In particular, the use of the spin-echo technique as a means of decoupling the effects of heteronuclei is demonstrated. The first chapter provides a general introduction to the basic phenomenon of N.M.R. and its particular application to liquid crystalline phases and to the spin echo and its applications in high-resolution N.M.R. Chapter II presents a theory, using the density matrix formulism, for calculating the response of a partially ordered spin system to the spin echo. Chapter III describes the experiment and discusses, with the aid of several examples, the practical problems involved in acquiring and analysing spin echo spectra. Chapter IV introduces the spin antiecho experiment in which the timing of pulses and acquisition is changed from that in the echo so as to produce a contrasting effect. A theory is presented to calculate antiecho spectra and the technique is applied to a variety of systems. Chapter V is a preliminary report on an experiment to produce symmetry selective N.M.R spectra. Chapter VI reports an investigation of the structure of ethylbenzene in a partially ordered phase and chapter VII is a study of the ordering of two new fluorinated liquid crystals; both these studies rely on the spin echo experiment for important results. Finally, chapter VIII describes an investigation of the structure of the compound trimethyldioxorhenium in a partially ordered phase.
University of Southampton
1983
Avent, Anthony Graham
(1983)
Multipulse nuclear magnetic resonance of liquid crystals.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
In this work a number of multipulse N.M.R. techniques are applied to the problem of interpreting the N.M.R. spectra of partially ordered phases and their usefulness is investigated. In particular, the use of the spin-echo technique as a means of decoupling the effects of heteronuclei is demonstrated. The first chapter provides a general introduction to the basic phenomenon of N.M.R. and its particular application to liquid crystalline phases and to the spin echo and its applications in high-resolution N.M.R. Chapter II presents a theory, using the density matrix formulism, for calculating the response of a partially ordered spin system to the spin echo. Chapter III describes the experiment and discusses, with the aid of several examples, the practical problems involved in acquiring and analysing spin echo spectra. Chapter IV introduces the spin antiecho experiment in which the timing of pulses and acquisition is changed from that in the echo so as to produce a contrasting effect. A theory is presented to calculate antiecho spectra and the technique is applied to a variety of systems. Chapter V is a preliminary report on an experiment to produce symmetry selective N.M.R spectra. Chapter VI reports an investigation of the structure of ethylbenzene in a partially ordered phase and chapter VII is a study of the ordering of two new fluorinated liquid crystals; both these studies rely on the spin echo experiment for important results. Finally, chapter VIII describes an investigation of the structure of the compound trimethyldioxorhenium in a partially ordered phase.
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Published date: 1983
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Local EPrints ID: 459939
URI: http://eprints.soton.ac.uk/id/eprint/459939
PURE UUID: 7b7ec9fb-d61d-46c3-8114-a302be7f4ff7
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Date deposited: 04 Jul 2022 17:28
Last modified: 04 Jul 2022 17:28
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Author:
Anthony Graham Avent
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