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Magnetic field compensation for field-cycling NMR relaxometry in the ULF band

机译：ULF波段中用于磁场循环NMR弛豫法的磁场补偿

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摘要

In setting up field-cycling experiments aimed to study physical phenomena in the low-field region, magnetic field contributions from external sources (Earth's field, environment, other magnets, etc.) become important. Indeed, a compensation of these contributions has successfully been used for the application of field-cycling methods to nuclear magnetic relaxation and double resonance experiments. This feature becomes relevant in samples where local fields are strongly averaged due to motional narrowing, on the ground that relaxation experiments can therefore be extended to lower fields. Compensation of external contributions is also crucial for the study of kinky processes related to internal local fields. In this article we outline NMR field-cycling experiments aimed to detect and quantify the external net magnetic field sensed by the spin-system. Both parallel and normal components with respect to the high-field Zeeman axis can be determined separately by using different experimental protocols. [References: 4]
机译：在建立旨在研究低场区域物理现象的场循环实验时，来自外部来源（地球的场，环境，其他磁体等）的磁场贡献就变得很重要。实际上，这些贡献的补偿已成功地用于磁场循环方法在核磁弛豫和双共振实验中的应用。该特征在由于运动变窄而局部场被强烈平均的样本中变得很重要，因为可以将松弛实验扩展到较低的场。外部贡献的补偿对于研究与内部局部场有关的变态过程也至关重要。在本文中，我们概述了NMR场循环实验，旨在检测和量化自旋系统感测到的外部净磁场。通过使用不同的实验方案，可以分别确定相对于高场塞曼轴的平行分量和法向分量。 [参考：4]

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