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Enhancing the sensitivity of NMR by Dynamic Nuclear Polarisation

Saunders, Martin Graham (2011)
Ph.D. thesis, University of Birmingham.

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Abstract

Dynamic Nuclear Polarisation (DNP) is a method used to increase the signal available for nuclear magnetic resonance (NMR) experiments. DNP is one of many hyperpolarisation methods and one implementation, so called ex-situ DNP, sees the sample polarised with a stable radical doping agent at low temperature and with microwave irradiation in a magnetic field before transfer to a second higher field NMR magnet to acquire a liquid state NMR spectrum. The primary goal of this project has been to gain an understanding of the underlying reasons for unpredictable ex-situ DNP polarisation failures and to develop methods to overcome these limitations. In the course of the work an additional polarisation mechanism arising from hindered methyl rotors was discovered. This thesis describes the preparation of DNP samples and the way in which DNP-NMR experiments are performed have been optimised. The concept of a co-polarisation agent has been introduced and methods employing a Nuclear Overhauser Effect have been implemented. Additionally the identification and characterisation of a quantum tunnelling effect that is a variant of the commonly known Haupt effect. Finally these methods have been combined in a number of situations to give results that would have otherwise been unobtainable.

Type of Work:Ph.D. thesis.
Supervisor(s):Gunther, Ulrich and Ludwig, Christian
School/Faculty:Colleges (2008 onwards) > College of Medical & Dental Sciences
Department:School of Cancer Sciences, HWB-NMR
Subjects:R Medicine (General)
RC0254 Neoplasms. Tumors. Oncology (including Cancer)
Institution:University of Birmingham
ID Code:2962
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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