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 1613-7507Full text not available from this repository.
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.
|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|
|Deposited On:||28 Feb 2012 13:38|
|Last Modified:||26 Jul 2012 20:09|
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