应用简单易实现的解耦脉冲方案组合在减少伪影的情况下实现大值解耦

K. Klika
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引用次数: 13

摘要

在宽带解耦中使用标准解耦脉冲方案将一种核类型从另一种核类型解耦的各种问题中,一个特别的挑战是当耦合常数的大小非常大时实现完全的、无伪影的解耦。本文证明,使用连续波(CW)照射和绝热脉冲解耦(APD)、MPF解耦或传统复合脉冲解耦(CPD)方案(如WALTZ或GARP)的组合,可以实现磷酸二乙酯HP(=O)(OCH2CH3)2的31P核磁共振谱的1H解耦,尽管693 Hz的值很大。所考虑的策略简单、有效,并且易于在大多数仪器上实现。在标准脉冲宽度为60 μs的GARP条件下,连续波和连续波的结合效果最好。总之,该方法的优点包括低功耗要求、完全解耦、大值范围的容限、标准尺寸值的大带宽以及侧带的抑制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Application of Simple and Easy to Implement Decoupling Pulse Scheme Combinations to Effect Decoupling of Large Values with Reduced Artifacts
Of the various problems in decoupling one nucleus type from another using standard decoupling pulse schemes for broadband decoupling, a particular challenge is to effect full, artifact-free decoupling when the size of the coupling constant is very large. Herein it is demonstrated that 1H decoupling of the 31P NMR spectrum of diethyl phosphonate HP(=O)(OCH2CH3)2 can be accomplished with reduced artifacts despite the large value of 693 Hz by using a combination of decoupling pulse schemes involving continuous-wave (CW) irradiation and either adiabatic-pulse decoupling (APD), MPF decoupling, or traditional composite-pulse decoupling (CPD) schemes such as WALTZ or GARP. The considered strategy is simple, efficient, and easy to implement on most instruments. The best result was attained for a combination of CW and CPD using GARP with a standard pulse width of 60 μs. Altogether, the advantages of the methodology include low power requirements, complete decoupling, tolerance of a range of large values, large bandwidth for normal-sized values, and the suppression of sidebands.
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