期刊
JOURNAL OF MAGNETIC RESONANCE
卷 239, 期 -, 页码 61-68出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2013.11.017
关键词
TOBSY; Solid-state NMR; Decoupling; Magic-angle spinning
资金
- Swiss National Science Foundation [200020_134681]
- ETH Zurich [ETH-04 09-3]
- PEP grant from the Indo-Swiss Joint Research Program (ISJRP)
- Swiss National Science Foundation (SNF) [200020_134681] Funding Source: Swiss National Science Foundation (SNF)
We show that heteronuclear decoupling during symmetry-based C9 TOBSY sequences can be improved by using phase-alternating pulse sequences (XiX) instead of cw irradiation. The use of XiX sequences makes the optimization of the decoupling if-field amplitude simpler and lowers the decoupling requirements to attain a comparable performance. A Floquet analysis of the first-order resonance conditions was used to determine the correct timing of the XiX sequence to avoid interference between the C sequence and the decoupling. The decoupling performance is analyzed analytically using Floquet theory and verified using numerical simulations as well as experimental results. (C) 2013 Elsevier inc. All rights reserved.
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