Symmetry principles for the design of radiofrequency pulse sequences in the nuclear magnetic resonance of rotating solids
Symmetry principles for the design of radiofrequency pulse sequences in the nuclear magnetic resonance of rotating solids
复制标题
DOI：
10.1016/s0009-2614(00)00340-7
复制
发表时间：
2000-04-28
影响因子：
2.8
通讯作者：
Levitt, MH
中科院分区：
文献类型：
--
作者：
Carravetta, M;Edén, M;Levitt, MH
本文提出了一些新的对称性定理，简化了魔角旋转固体核磁共振中多脉冲射频脉冲序列的设计。对称性定理适用于由脉冲序列元素R的N次重复组成的序列RNR 1，其相位在值+/-piv/N之间交替。每个R元件理想地使自旋围绕旋转框架x轴旋转角度pi。整个RNTR序列被定时为跨越n个旋转周期。给出了同素双量子和零量子再耦合、异素退耦和异素再耦合的应用。(C)2000 Elsevier Science B. V.保留所有权利。
Some new symmetry theorems are presented which simplify the task of designing multiple-pulse radio-frequency pulse sequences in magic-angle-spinning solid-state NMR. The symmetry theorems apply to sequences denoted RNnv which consists of N repetitions of a pulse sequence element R, alternating in phase between the values +/- pi v/N. Each R element ideally rotates the spins by an angle pi about the rotating frame x-axis. The entire RNnv sequence is timed to span n rotational periods. Applications are presented for homonuclear double-quantum and zero-quantum recoupling, heteronuclear decoupling and heteronuclear recoupling. (C) 2000 Elsevier Science B.V. All rights reserved.