QCPMG-MAS NMR of Half-Integer Quadrupolar Nuclei

Larsen, Flemming H.; Jakobsen, Hans J.; Ellis, Paul D.; Nielsen, Niels Chr.

doi:10.1006/jmre.1997.1341

Cited by 141 publications

(186 citation statements)

References 24 publications

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“…Other parameters are adjusted as described previously [2,3]. Fourier transformation of a FID acquired this way results in splitting of the resonance lines into spinecho sidebands separated by 1=s a .…”

Section: Methodsmentioning

confidence: 99%

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29Si and 17O (Q)CPMG-MAS solid-state NMR experiments as an optimum approach for half-integer nuclei having long T1 relaxation times

Larsen¹,

Farnan²

2002

Chemical Physics Letters

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29 Si up to 37 h were saved compared to the MAS experiment using longer recycle periods (up to 3600 s) but fewer scans. The spectrum reconstructed from the echoes provides similar spectral information as the MAS spectrum. In the 17 O spectrum increased sensitivity facilitated determination of CSA in a-quartz at 9.4 T and points towards a method to obtain natural abundance 17 O spectra of non-cubic oxides. Ó

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Section: Methodsmentioning

confidence: 99%

“…In this work the Carr-Purcell-Meiboom-Gill [1] MAS (CPMG-MAS) or the Quadrupolar CPMG-MAS (QCPMG-MAS) experiment [2,3] will be shown to be a robust method for dealing with such compounds. The presence of a long in inorganic oxides and minerals is generally accompanied by a long transverse relaxation time (T 2 ).…”

Section: Introductionmentioning

confidence: 99%

29Si and 17O (Q)CPMG-MAS solid-state NMR experiments as an optimum approach for half-integer nuclei having long T1 relaxation times

Larsen¹,

Farnan²

2002

Chemical Physics Letters

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“…The so-called QCPMG-MAS experiments were used to achieve S/N ratio enhancements of about one order of magnitude for the CT spectrum of half-integer spin quadrupolar nuclei. 75 The dominant inhomogeneous interaction in this case (associated with the envelope of the spikelets spectra) was the second-order quadrupolar broadening of the CT, which is only partially removed by MAS. 6,9 The pulse sequence used in this QCPMG-MAS experiment is illustrated in Figure 9.…”

Section: The Qcpmg Experimentsmentioning

confidence: 99%

Recent Advances in Solid-State 25Mg NMR Spectroscopy

Freitas

Smith

2012

Annual Reports on NMR Spectroscopy

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“…Synchronization of the pulses with the rotor period proved efficient (10) but limits the spectral width in the MQMAS experiment. During QCPMG (11) experiments that are based on the Carr-Purcell-Meiboom-Gill echo sequence, the central transition MAS echoes following the MQMAS sequence are successively accumulated to enhance the overall signal intensity. This approach generates sidebands along the F 2 MAS dimension.…”

Section: Introductionmentioning

confidence: 99%