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(33)S MAS NMR of a disordered sulfur-doped silicate: signal enhancement via RAPT, QCPMG and adiabatic pulses

O'Dell, L. A. and Klimm, K. and Freitas, J. C. C. and Kohn, S. C. and Smith, Mark E. (2009) (33)S MAS NMR of a disordered sulfur-doped silicate: signal enhancement via RAPT, QCPMG and adiabatic pulses. Applied Magnetic Resonance, 35 (2). pp. 247-259. ISSN 1613-7507

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Abstract

Three different signal enhancement techniques have been applied to (33)S magic-angle spinning nuclear magnetic resonance (MAS NMR) of a disordered silicate containing 1.15 wt% (33)S. Partial saturation of the satellite transitions was achieved using a rotor-assisted population transfer (RAPT) pulse sequence, resulting in a signal enhancement of 1.63, albeit with a slight distortion of the line shape due to selective excitation. Adiabatic inversion of the satellite transitions by various amplitude-and frequency-modulated pulse shapes (such as hyperbolic secant and wideband uniform-rate smooth truncation) was also attempted, resulting in a signal enhancement of up to 1.85, with no apparent line shape distortion. Quadrupolar Carr-Purcell-Meiboom-Gill (QCPMG) and RAPT-QCPMG sequences were also used, both of which yielded spikelet spectra that accurately reflected the MAS line shape with a greatly improved signal-to-noise ratio. It is hoped that this study demonstrates that (33)S solid-state MAS NMR is now feasible even on disordered, low-sulfur-content systems.

Item Type: Article
Journal or Publication Title: Applied Magnetic Resonance
Uncontrolled Keywords: INTEGER QUADRUPOLAR NUCLEI ; SOLID-STATE NMR ; HYPERBOLIC SECANT PULSES ; DOUBLE FREQUENCY SWEEPS ; NATURAL-ABUNDANCE ; SENSITIVITY ENHANCEMENT ; SATELLITE TRANSITIONS ; POPULATION TRANSFER ; COUPLING-CONSTANTS ; SPECTRA
Subjects:
Departments: VC's Office
ID Code: 52833
Deposited By: ep_importer_pure
Deposited On: 28 Feb 2012 13:38
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 23:09
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/52833

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