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Developing and Assessing a Nuclear Magnetic Resonance Method for Measuring Nuclear Spin Conversion of Ground State Polyatomic Molecules / THOMAS CARTER

Swansea University Author: THOMAS CARTER

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DOI (Published version): 10.23889/SUThesis.71844

Abstract

The phenomenon of nuclear spin conversion is observed in a wide variety of molecules with a wide variety of experimental methods. This thesis presents and NMR method for measuring nuclear spin conversion in water isolated in an argon cryomatrix. The work serves as a complement to existing fourier tr...

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Published: Swansea 2026
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Alexandrowicz, G., and Chadwick, H.
URI: https://cronfa.swan.ac.uk/Record/cronfa71844
first_indexed 2026-04-30T14:56:14Z
last_indexed 2026-05-01T07:23:54Z
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spelling 2026-04-30T15:58:46.0937769 v2 71844 2026-04-30 Developing and Assessing a Nuclear Magnetic Resonance Method for Measuring Nuclear Spin Conversion of Ground State Polyatomic Molecules 8ce8555f3d0250a5edc9b1f7e3c268c9 THOMAS CARTER THOMAS CARTER true false 2026-04-30 The phenomenon of nuclear spin conversion is observed in a wide variety of molecules with a wide variety of experimental methods. This thesis presents and NMR method for measuring nuclear spin conversion in water isolated in an argon cryomatrix. The work serves as a complement to existing fourier transform infrared spectroscopy (FTIR) studies of nuclear spin conversion in the same system. FTIR has traditionally been preferred over NMR due to its significantly higher sensitivity, however, the results obtained here evidence that measuring the nuclear spin conversion (NSC) of matrix-isolated water samples with NMR is entirely feasible, with potential to outperform FTIR in high concentration measurements where the presence of broad background peaks renders FTIR infeasible.As a compliment to this work, the thesis also discusses experiments attempting to measure hyperpolarised signal from a magnetically focussed methane beam. A hyperpolarisation method which theoretically should allow the NMR detection of molecules at a scale equivalent to a single surface layer. While the overall measurements were unsuccessful, the technique is highlighted as a potential method for answering the currently outstanding question: “Is molecular hyperpolarisation preserved during adsorption to a cold surface?” E-Thesis Swansea Nuclear Magnetic Resonance, NMR, Nuclear Spin Conversion, NSC, Water, Methane, Argon, Cryomatrix 26 3 2026 2026-03-26 10.23889/SUThesis.71844 COLLEGE NANME COLLEGE CODE Swansea University Alexandrowicz, G., and Chadwick, H. Doctoral Ph.D ERC consolidator grant ERC consolidator grant 2026-04-30T15:58:46.0937769 2026-04-30T15:50:33.5248196 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemistry THOMAS CARTER 1 71844__36654__bbbbd2363f854e59b002cab6dd57c713.pdf 2026_Carter_T.final.71844.pdf 2026-04-30T15:55:16.3825486 Output 8200904 application/pdf E-Thesis – open access true Copyright: the author, Thomas Carter, 2026. Distributed under the terms of a Creative Commons Attribution NonCommercial 4.0 License (CC BY-NC 4.0) true eng https://creativecommons.org/licenses/by-nc/4.0/
title Developing and Assessing a Nuclear Magnetic Resonance Method for Measuring Nuclear Spin Conversion of Ground State Polyatomic Molecules
spellingShingle Developing and Assessing a Nuclear Magnetic Resonance Method for Measuring Nuclear Spin Conversion of Ground State Polyatomic Molecules
THOMAS CARTER
title_short Developing and Assessing a Nuclear Magnetic Resonance Method for Measuring Nuclear Spin Conversion of Ground State Polyatomic Molecules
title_full Developing and Assessing a Nuclear Magnetic Resonance Method for Measuring Nuclear Spin Conversion of Ground State Polyatomic Molecules
title_fullStr Developing and Assessing a Nuclear Magnetic Resonance Method for Measuring Nuclear Spin Conversion of Ground State Polyatomic Molecules
title_full_unstemmed Developing and Assessing a Nuclear Magnetic Resonance Method for Measuring Nuclear Spin Conversion of Ground State Polyatomic Molecules
title_sort Developing and Assessing a Nuclear Magnetic Resonance Method for Measuring Nuclear Spin Conversion of Ground State Polyatomic Molecules
author_id_str_mv 8ce8555f3d0250a5edc9b1f7e3c268c9
author_id_fullname_str_mv 8ce8555f3d0250a5edc9b1f7e3c268c9_***_THOMAS CARTER
author THOMAS CARTER
author2 THOMAS CARTER
format E-Thesis
publishDate 2026
institution Swansea University
doi_str_mv 10.23889/SUThesis.71844
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemistry{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemistry
document_store_str 1
active_str 0
description The phenomenon of nuclear spin conversion is observed in a wide variety of molecules with a wide variety of experimental methods. This thesis presents and NMR method for measuring nuclear spin conversion in water isolated in an argon cryomatrix. The work serves as a complement to existing fourier transform infrared spectroscopy (FTIR) studies of nuclear spin conversion in the same system. FTIR has traditionally been preferred over NMR due to its significantly higher sensitivity, however, the results obtained here evidence that measuring the nuclear spin conversion (NSC) of matrix-isolated water samples with NMR is entirely feasible, with potential to outperform FTIR in high concentration measurements where the presence of broad background peaks renders FTIR infeasible.As a compliment to this work, the thesis also discusses experiments attempting to measure hyperpolarised signal from a magnetically focussed methane beam. A hyperpolarisation method which theoretically should allow the NMR detection of molecules at a scale equivalent to a single surface layer. While the overall measurements were unsuccessful, the technique is highlighted as a potential method for answering the currently outstanding question: “Is molecular hyperpolarisation preserved during adsorption to a cold surface?”
published_date 2026-03-26T17:20:30Z
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score 11.106612

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