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首页> 外文期刊>Journal of magnetic resonance >Multiple-Quantum J-Resolved NMR Spectroscopy (MQ-JRES): Measurement of Multiple-Quantum Relaxation Rates and Relative Signs of Spin Coupling Constants
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Multiple-Quantum J-Resolved NMR Spectroscopy (MQ-JRES): Measurement of Multiple-Quantum Relaxation Rates and Relative Signs of Spin Coupling Constants

机译:多重量子J分辨NMR光谱(MQ-JRES):多重弛豫速率和自旋耦合常数的相对符号的测量

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摘要

The technique of multiple-quantum J-resolved NMR spectroscopy (MQ-JRES) is introduced and applied to the spin system SI_3-M (such as in the example given here, the ~(13)CH_3-~(12)CH in alanine). The SI_3 spin system was excited to its highest quantum state (8S_yI_xI_yI_y), which consists of four coherences: quadruple quantum of (3I + S), double quantum of (3I - S), double quantum of (I + S),. And zero quantum of (I - S). In the MQ spectrum generated from the projection into the F_1 dimension, the resonances of the different multiple-quantum coherences are resolved by their coupling constants to the remote spin (M). The absorptive lineshapes in both F_1 and F_2 dimensions enable accurate measurements of transverse relaxation rates, and both amplitude and relative signs of the long-range coupling constants are to be derived from either frequency or time domain data. The selective detection of MQ-JRES spectra of the individual MQ coherences using either phase cycling or pulsed field gradients is presented.
机译:介绍了多量子J分辨NMR光谱技术(MQ-JRES)并将其应用于自旋系统SI_3-M(例如在此处给出的示例中,丙氨酸中的〜(13)CH_3-〜(12)CH )。 SI_3自旋系统被激发到最高量子态(8S_yI_xI_yI_y),该态由四个相干组成:(3I + S)的四重量子,(3I-S)的双量子,(I + S)的双量子。和(I-S)的零量子。在从投影到F_1维的MQ光谱中,不同的多量子相干的共振通过与远程自旋(M)的耦合常数来解析。 F_1和F_2维度中的吸收线形都可以精确测量横向弛豫率,并且应从频域或时域数据中得出远程耦合常数的幅度和相对符号。提出了使用相位循环或脉冲场梯度选择性检测各个MQ相干的MQ-JRES光谱的方法。

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