✍ Scribed by Jean-Paul Amoureux; Christian Fernandez; Lucio Frydman
No coin nor oath required. For personal study only.
It has been recently shown that second-order anisotropies can be removed from solid phase NMR spectra of quadrupolar nuclei via the combined use of magic-angle spinning (MAS) and bidimensional multiple-quantum (MQ) spectroscopy. The present study investigates the conditions under which the acquisition of such high-resolution MQMAS NMR spectra are optimized. The excitation and conversion pulse lengths that maximize 0 -~ _ 3(t 1) ~ -l(t 2) coherence transfer pathway signals for arbitrary spin numbers were calculated, as were the pulse lengths that provide NMR spectra free from dispersive line shape distortions. For the case of spin-5/2 nuclei, the conditions which optimize experiments involving quintuplequantum coherences were also determined.
📜 SIMILAR VOLUMES
## Abstract We here report on the influence of heteronuclear dipolar decoupling on the ^27^Al 3QMAS, 5QMAS, and the double‐quantum filter–satellite‐transition magic‐angle spinning (DQF‐STMAS) spectra of a strongly dipolar‐coupled system, gibbsite. The requirements for heteronuclear dipolar decoupli
## Abstract A comprehensive experimental and numerical study of the potential of fast amplitude (FAM) irradiation for improving the triple‐quantum (3Q) magic angle spinning (MAS) NMR spectra of half‐integer $I > {1 \over 2}$ nuclei (^23^Na, ^27^Al, ^45^Sc, ^93^Nb) was carried out. Materials of acad
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