The return of the frequency sweep: Designing adiabatic pulses for contemporary NMR
The return of the frequency sweep: Designing adiabatic pulses for contemporary NMR
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DOI：
10.1006/jmre.2001.2340
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发表时间：
2001-12-01
影响因子：
2.2
通讯作者：
DelaBarre, L
中科院分区：
文献类型：
--
作者：
Garwood, M;DelaBarre, L
根据绝热原理工作的调频(FM)脉冲在核磁共振的许多领域中变得越来越流行。绝热脉冲通常可以扩展实验能力，并将恼人的实验缺陷降至最低。在这里，绝热原理和一些目前用于产生这些脉冲的方法被考虑。经典绝热快速通过是所有绝热脉冲和绝热序列所基于的基本元素，在不同的旋转坐标系中使用矢量模型进行了分析。描述了两种优化绝热性的方法，并演示了如何调整调制函数以最好地满足特定的实验需要。最后，我们考虑了绝热平面旋转脉冲和频率选择性多自旋回波序列。(C)2001年爱思唯尔科学公司。
Frequency-modulated (FM) pulses that function according to adiabatic principles are becoming increasingly popular in many areas of NMR. Often adiabatic pulses can extend experimental capabilities and minimize annoying experimental imperfections. Here, adiabatic principles and some of the current methods used to create these pulses are considered. The classical adiabatic rapid passage, which is a fundamental element upon which all adiabatic pulses and sequences are based, is analyzed using vector models in different rotating frames of reference. Two methods to optimize adiabaticity are described, and ways to tailor modulation functions to best satisfy specific experimental needs are demonstrated. Finally, adiabatic plane rotation pulses and frequency-selective multiple spin-echo sequences are considered. (C) 2001 Elsevier Science.