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Article Dans Une Revue Journal of Chemical Physics Année : 2002

A Carr-Purcell-Meiboom-Gill Approach to Multidimensional Solid-State NMR of Quadrupolar Nuclei

Résumé

Data acquisition using the Carr–Purcell–Meiboom–Gill (CPMG) train of pi pulses has been recently explored in multiple quantum magic angle spinning (MQMAS) nuclear magnetic resonance of half-integer quadrupolar nuclei [T. Vosegaard, F. H. Larsen, H. J. Jakobsen, P. D. Ellis, and N. C. Nielsen, J. Am. Chem. Soc. 119, 9055 (1997)]. Significant increase of sensitivity can be obtained by using this technique at the expense of spectral definition, as the spectrum transforms into a manifold of narrow sidebands. A detailed analysis of the CPMG method, with emphasis on the MQMAS experiment, is presented. The MQ-QCPMG-MAS approach is adapted to spin-5/2 nuclei. Several numerical methods of data treatment are shown that allow for improvement of the definition of the sideband envelope, reconstruction of the standard line shape, and improvement of S/N ratio via optimized filtering. Theoretical and experimental estimates of signal enhancement through proper acquisition and processing of MQ-QCPMG-MAS data are given.
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Dates et versions

hal-00090318 , version 1 (30-08-2006)

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Citer

Ronan Lefort, J. W. Wiench, M. Pruski, J.-P. Amoureux. A Carr-Purcell-Meiboom-Gill Approach to Multidimensional Solid-State NMR of Quadrupolar Nuclei. Journal of Chemical Physics, 2002, 116(6), pp.2493-2501. ⟨10.1063/1.1433000⟩. ⟨hal-00090318⟩

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