Analysis and implications of transition-band signals in high-resolution NMR
Analysis and implications of transition-band signals in high-resolution NMR
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DOI：
10.1006/jmre.1998.1599
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发表时间：
1998-12-01
影响因子：
2.2
通讯作者：
Szantay, C
中科院分区：
文献类型：
--
作者：
Szantay, C
在使用标准测量技术的背景下讨论了在有源线圈区域之外的区域中生成和接收的信号的问题。强调了这种过渡带信号的存在的一些概念和实际后果。示例包括辐射阻尼、脉冲宽度校准、线形和射频均匀性测试、不适当的饱和度以及交换率和弛豫率测定。一个有趣的含义是，校准的 90 度脉冲宽度值中明显的样本间变化不仅是探头调谐和体磁化率效应的函数，而且也是所涉及的线宽的函数。还给出了该现象的半定量处理。 (C) 1998 年学术出版社。
The problem of signals generated in and received from regions outside the active coil area is discussed in the context of using standard measurement techniques. Some of the conceptual and practical consequences of the existence of such transition-band signals are highlighted. Examples include radiation damping, pulse-width calibration, lineshape and radiofrequency homogeneity tests, improper saturation, and exchange- and relaxation-rate determinations. One interesting implication is that apparent sample-to-sample variations in the calibrated 90 degrees pulse width values are a function not only of probe tuning and bulk susceptibility effects, but also of the linewidths involved. A semi-quantitative treatment of the phenomenon is also given. (C) 1998 Academic Press.