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Reference: Levitt, Malcolm H., (1981). New techniques in nuclear magnetic resonance. DPhil. University of Oxford.Citable link to this page:


New techniques in nuclear magnetic resonance

Abstract: The effect of short, strong radiofrequency pulses on thenuclear spin system is examined. Providing the durations of thepulses are short with respect to coupling constants within thespin system, they may be described by simple rotation operatorswhich are exponential functions of the angular momentum operators.Operator algebra can be used to define the interaction of suchpulses with the spin system, and the mutual interaction of asequence of pulses. The case of a simple coupled spin system isexamined in detail and it is found that a vector model can be usedto describe the motion of the expectation values of the observables.This model also allows treatment of such 'non-classical 1 effects ascoherence transfer and multiple-quantum coherence. The proposal isalso made that certain types of pulse imperfection may be compensatedby using specially constructed sequences of small numbers of pulses,which are termed 'composite pulses'. Their compensatory action isillustrated by computer simulation, and by experimental results.In the case of certain symmetrical composite pulses, operator algebracan be used to understand their overall effect in the presence ofpulse imperfections, suggesting their use in such critical applicationsas multiple spin echo trains. Another class of symmetricalcomposite pulses provides rotations by arbitrary angles around thez-axis of the rotating reference frame, and is expected to be ofuse in multiple-quantum spectroscopy.

Type of Award:DPhil Level of Award:Doctoral Awarding Institution: University of Oxford Notes:This thesis was digitised thanks to the generosity of Dr Leonard Polonsky


Freeman, RayMore by this contributor



Dr. R. FreemanMore by this contributor


 Bibliographic Details

Issue Date: 1981Identifiers

Urn: uuid:8365b030-de70-4b96-a9a0-e0fd32290551

Source identifier: 603840218 Item Description

Type: Thesis;

Language: eng Subjects: Nuclear magnetic resonance High resolution spectroscopy Radiofrequency spectroscopy Nuclear spin Tiny URL: td:603840218


Autor: Levitt, Malcolm H. - institutionUniversity of Oxford facultyMathematical and Physical Sciences Division - - - - Contributors Free



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