Two-Dimensional Multiple-Quantum MAS NMR of Quadrupolar Nuclei. Acquisition of the Whole Echo
โ Scribed by Steven P. Brown; Stephen Wimperis
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 160 KB
- Volume
- 124
- Category
- Article
- ISSN
- 1090-7807
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๐ SIMILAR VOLUMES
## Cross-polarization from 1 H to the multiple-quantum coherences of a quadrupolar nucleus is used in combination with the twodimensional multiple-quantum magic angle spinning (MQMAS) NMR experiment in order to extract high-resolution CPMAS NMR spectra. The technique is demonstrated on 23 Na (S โซุ
The distributions of both the quadrupolar and the isotopic chemical shift interactions are shown to give multiple-quantum MAS spectra that remain tilted after shearing. For both types of distribution, the theoretical slopes, formed by the resulting distribution of the centers of gravity of the signa
The effects of magnetic fields B 0 and B 1 inhomogeneities on either by a 180ะ pulse in the middle of the creation time in techniques which are commonly used for the measurements of the standard TQF sequence (Fig. 1a) (6) or by selecting a triple-quantum-filtered (TQF) NMR spectroscopy of 23 Na in b