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Optimisation of excitation schemes for ¹⁴N overtone MAS NMR using numerically exact simulations
Numerically exact simulations of the (14)N overtone ((14)N(OT)) MAS NMR experiment are used to investigate the effects of the applied magnetic field strength as well as three types of excitation pulse. The results show that both the resolution and sensitivity of (14)N(OT) MAS NMR increase linearly with the applied static magnetic field strength. Standard RF excitation pulses are compared with frequency-swept WURST pulses as well as several composite pulses. WURST pulses are demonstrated to provide the largest bandwidths, while the direction of the frequency sweep is shown to be important when these pulses are used for the direct observation of (14)N(OT) signals. A composite pulse is shown to provide the most efficient excitation overall, but only when applied on resonance. WURST excitation pulses are therefore the best option when studying a sample with unknown (14)N NMR parameters.
History
Journal
Solid state nuclear magnetic resonanceVolume
84Season
July-AugustPagination
34 - 40Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0926-2040eISSN
1527-3326Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2016, Elsevier Inc.Usage metrics
Keywords
(14)N solid-state NMRComposite pulsesExcitation pulsesOvertone spectroscopyWURST pulsesScience & TechnologyPhysical SciencesTechnologyChemistry, PhysicalPhysics, Atomic, Molecular & ChemicalPhysics, Condensed MatterSpectroscopyChemistryPhysicsN-14 solid-state NMRWORST pulsesSOLID-STATE NMRNUCLEAR-MAGNETIC-RESONANCEBROAD-BAND EXCITATIONPULSESSAMPLECondensed Matter Physics
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