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首页> 外文期刊>Journal of magnetic resonance >Cascaded z-filters for efficient single-scan suppression of zero-quantum coherence
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Cascaded z-filters for efficient single-scan suppression of zero-quantum coherence

机译：级联的z滤波器可有效抑制零量子相干的单次扫描

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摘要

A simple and robust method to suppress zero-quantum coherence (ZQC) in NMR experiments, in a single scan and with very high suppression ratio, is described. It is an appreciable improvement on a previous technique by Thrippleton and Keeler [Angew. Chem. Int. Ed. 42 (2003) 3938]. The method, called a z-filter cascade, preserves longitudinal, or z-magnetization, with high efficiency. Losses depend mostly on T_1 relaxation but not T_2 relaxation mechanisms. At the same time, suppression of ZQC can be essentially complete in a single scan. The time duration of the z-filter cascade scales inversely to representative chemical shift differences between the coupled spins, and is typically a few tens of milliseconds. The high efficiency of the zero-quantum suppression and excellent retention of the desired z-magnetization, in a single scan without resort to phase cycling or difference spectroscopy, makes the z-filter cascade a useful new pulse sequence building block for a whole range of NMR experiments. In cases where unwanted residual ZQC may have previously contributed to baseline "t_1-noise" in two-dimensional NMR spectra, the z-filter cascade can deliver a noteworthy improvement in spectral quality.
机译：描述了一种简单强壮的方法，可以在NMR实验中以单次扫描和非常高的抑制率抑制零量子相干（ZQC）。这是对Thrippleton和Keeler [Angew。的先前技术的明显改进。化学诠释埃德42（2003）3938]。该方法称为z滤波器级联，可高效保留纵向磁化或z磁化强度。损失主要取决于T_1松弛，而不取决于T_2松弛机制。同时，对ZQC的抑制基本上可以在一次扫描中完成。 z滤波器级联的持续时间与耦合的自旋之间的代表性化学位移差异成反比，通常为几十毫秒。零量子抑制的高效率和所需z磁化强度的出色保留，在单次扫描中无需借助相位循环或差分光谱法，使得z滤波器级联成为整个范围内有用的新型脉冲序列构建块NMR实验。在不需要的残留ZQC可能先前已对二维NMR光谱中的基线“ t_1噪声”作出贡献的情况下，z滤波器级联可以在光谱质量方面带来显着的改善。

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