Selective saturation and inversion of multiple resonances in high-resolution solid-state 13C experiments using slow spinning CP/MAS and tailored DANTE pulse sequences
✍ Scribed by Jian Zhi Hu; Ronald J. Pugmire; Anita M. Orendt; David M. Grant; C. Ye
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 562 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0926-2040
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✦ Synopsis
Taking advantage of the long 13C T. values generally encountered in solids, selective saturation and inversion of more than one resonance in l3C CP/MAS experiments can be achieved by sequentially applying several DANTE pulse sequences centered at different transmitter frequency offsets. A new selective saturation pulse sequence is introduced composed of a series of 90°DANTE sequences separated by interrupted decoupling periods during which the selected resonance is destroyed. Applications of this method, including the simplification of the measurement of the principal values of the 13C chemical shift tensor under slow MAS conditions, are described. The determination of the arornaticity of coal using a relatively slow MAS rate is also described.