New recoupling techniques in solid-state NMR
New recoupling techniques in solid-state NMR
This thesis deals with the development of new methodology for homonuclear dipolar recoupling by symmetry-based radiofrequency pulse sequences in magic-angle spinning solid-state nuclear magnetic resonance.
The first chapters of this thesis introduce NMR spectroscopy, the basic theory of NMR and some basic elements. After these introductory chapters, the rotor-synchronized symmetry-based pulse sequences are described. Each class of symmetry-based pulse sequence is defined, introducing their selection rules and scaling factors for the recoupling of certain spin interactions.
In the second part, the main topics and subjects of the thesis are analysed more deeply. First, the interference of heteronuclear dipolar decoupling in the homonuclear dipolar recoupling by symmetry-based pulsed sequences is considered. These effects are studied by experiments, simulations and average Hamiltonian theory in two families of dipolar recoupling sequences belonging to the CNvn and the RNvn symmetry classes.
In the final chapter, a new recoupling concept in multiple-spin systems called truncated dipolar recoupling (TDR) is presented. This new concept allows the selective determination of internuclear distances in a wide variety of homonuclear multiple-spin systems. This methodology involves a symmetry-based recoupling sequence that generates: (i) Zero-quantum (ZQ) recoupling of homonuclear dipolar-dipole interactions; (ii) simultaneous recoupling of frequency-dispersing spin interactions that truncate the ZQ dipolar Hamiltonian. This truncation of the spin Hamiltonian allows the commutation of the different dipolar coupling in the multiple spin system. Two different implementations of this idea are discussed and demonstrated experimentally and by numerical simulations.
University of Southampton
Marín Montesinos, Ildefonso
3a84d29e-130d-4983-9834-03bc0beeb86f
2007
Marín Montesinos, Ildefonso
3a84d29e-130d-4983-9834-03bc0beeb86f
Marín Montesinos, Ildefonso
(2007)
New recoupling techniques in solid-state NMR.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
This thesis deals with the development of new methodology for homonuclear dipolar recoupling by symmetry-based radiofrequency pulse sequences in magic-angle spinning solid-state nuclear magnetic resonance.
The first chapters of this thesis introduce NMR spectroscopy, the basic theory of NMR and some basic elements. After these introductory chapters, the rotor-synchronized symmetry-based pulse sequences are described. Each class of symmetry-based pulse sequence is defined, introducing their selection rules and scaling factors for the recoupling of certain spin interactions.
In the second part, the main topics and subjects of the thesis are analysed more deeply. First, the interference of heteronuclear dipolar decoupling in the homonuclear dipolar recoupling by symmetry-based pulsed sequences is considered. These effects are studied by experiments, simulations and average Hamiltonian theory in two families of dipolar recoupling sequences belonging to the CNvn and the RNvn symmetry classes.
In the final chapter, a new recoupling concept in multiple-spin systems called truncated dipolar recoupling (TDR) is presented. This new concept allows the selective determination of internuclear distances in a wide variety of homonuclear multiple-spin systems. This methodology involves a symmetry-based recoupling sequence that generates: (i) Zero-quantum (ZQ) recoupling of homonuclear dipolar-dipole interactions; (ii) simultaneous recoupling of frequency-dispersing spin interactions that truncate the ZQ dipolar Hamiltonian. This truncation of the spin Hamiltonian allows the commutation of the different dipolar coupling in the multiple spin system. Two different implementations of this idea are discussed and demonstrated experimentally and by numerical simulations.
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Published date: 2007
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Local EPrints ID: 466175
URI: http://eprints.soton.ac.uk/id/eprint/466175
PURE UUID: f5306e6c-6324-45e7-b171-6d14233e256c
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Date deposited: 05 Jul 2022 04:38
Last modified: 05 Jul 2022 04:38
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Author:
Ildefonso Marín Montesinos
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