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Triple-quantum MAS-NMR of quadrupolar nuclei

✍ Scribed by C. Fernandez; J.P. Amoureux

Book ID
103963810
Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
458 KB
Volume
5
Category
Article
ISSN
0926-2040

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✦ Synopsis

From two-dimensional multiquantum NMR spectra of quadrupolar nuclei, it is now possible to obtain much greater resolution than in a classical single-quantum magic-angle spinning or variable-angle spinning spectrum. We describe here a very simple pulse scheme which efficiently excites the desired multiquantum NMR coherence and a new acquisition procedure which yields to pure-absorption mode 2D spectra. Experimental spectra for 87Rb in polycrystalline rubidium nitrate illustrate the method.

πŸ“œ SIMILAR VOLUMES

Triple, quintuple and higher order multi
Triple, quintuple and higher order multiple quantum MAS NMR of quadrupolar nuclei
✍ J.-P. Amoureux; C. Fernandez πŸ“‚ Article πŸ“… 1998 πŸ› Elsevier Science 🌐 English βš– 128 KB

The optimization of the coherence transfers involved in five, seven and nine-quantum versions of the recently discovered MQMAS technique, is analysed numerically. Data reported in this paper may serve as starting parameters for the experiment set up. An analysis of the intensity and resolution given

High-resolution multiple quantum MAS NMR
High-resolution multiple quantum MAS NMR spectroscopy of half-integer quadrupolar nuclei
✍ Gang Wu; David Rovnyank; Boqin Sun; Robert G. Griffin πŸ“‚ Article πŸ“… 1996 πŸ› Elsevier Science 🌐 English βš– 500 KB

We demonstrate the utility of a two-pulse sequence in obtaining high-resolution solid state NMR spectra of half-integer quadrupolar nuclei with magic-angle-spinning (MAS). The experiment, which utilizes multiple/single-quantum correlation, was first described in a different form by Frydman and Harwo

QCPMG-MAS NMR of Half-Integer Quadrupola
QCPMG-MAS NMR of Half-Integer Quadrupolar Nuclei
✍ Flemming H. Larsen; Hans J. Jakobsen; Paul D. Ellis; Niels Chr. Nielsen πŸ“‚ Article πŸ“… 1998 πŸ› Elsevier Science 🌐 English βš– 97 KB

By combination of fast magic-angle spinning (MAS) and detection of the free-induction decay during a rotor-synchronized quadrupolar Carr-Purcell-Meiboom-Gill (QCPMG) train of refocusing pulses, the sensitivity of quadrupolar-echo MAS NMR spectra for the central transition of half-integer quadrupolar