Composite pulses for efficient excitation of half-integer quadrupolar nuclei in NMR of static and spinning solid samples
Composite pulses for efficient excitation of half-integer quadrupolar nuclei in NMR of static and spinning solid samples
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DOI：
10.1016/j.cplett.2012.01.058
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发表时间：
2012-03-19
影响因子：
2.8
通讯作者：
Bodenhausen, Geoffrey
中科院分区：
文献类型：
--
作者：
Carnevale, Diego;Bodenhausen, Geoffrey
(tau(P))(X)(2tau(P))(-x)(3tau(P))(X)类型的复合脉冲允许人们以半整数自旋激发原子核的中心跃迁，与简单的(tau(Sp)(P))(X)脉冲相比具有更高的效率。该方法在含有钠-23(I=3/2)、铝-27(I=5/2)和钪-45(I=7/2)的固体样品上进行了静态和幻角旋转条件下的测试。对i=3/2的数值模拟表明，这种增强是由于将与卫星跃迁相关的塞曼布居差更有效地转换为中心跃迁所致。(C)2012爱思唯尔B.V.保留所有权利。
Composite pulses of the type (tau(p))(x)(2 tau(p))(-x)(3 tau(p))(x) allow one to excite the central transition of nuclei with half-integer spin with enhanced efficiency compared to a simple (tau(sp)(p))(x) pulse. The method has been tested on solid samples containing sodium-23 (I = 3/2), aluminium-27 (I = 5/2) and scandium-45 (I = 7/2) under both static and magic-angle spinning conditions. Numerical simulations for I = 3/2 indicate that the enhancement is due to a more efficient conversion of Zeeman population differences associated with the satellite transitions to the central transition. (C) 2012 Elsevier B. V. All rights reserved.