Non-linearity and frequency shifts of nuclear magnetic spin-noise
Non-linearity and frequency shifts of nuclear magnetic spin-noise
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DOI：
10.1016/j.jmr.2009.01.019
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发表时间：
2009-05-01
影响因子：
2.2
通讯作者：
Mueller, Norbert
中科院分区：
文献类型：
--
作者：
Nausner, Martin;Schlagnitweit, Judith;Mueller, Norbert
我们系统地研究了质子核自旋噪声谱中观察到的谱线形状，它以一种复杂的方式依赖于共振电路的性质、存在的自旋数目、横向弛豫、非均匀展宽和辐射衰减。使用高灵敏度的高分辨率探针，通过液体样品的高分辨率H-1噪声功率核磁共振谱研究了这些依赖关系。观察到了与直觉预期的显著偏差。基于改进的奈奎斯特噪声方程的模拟被用来理解和解释实验结果。(C)2009 Elsevier Inc.保留所有权利。
We have systematically investigated the line shapes observed in proton nuclear spin-noise spectra which depend in a complex way on the properties of the resonance circuit, the number of spins present, transverse relaxation, inhomogeneous broadening, and radiation damping. Using highly sensitive high resolution probes these dependencies are investigated by way of high resolution H-1 noise power NMR spectra of liquid samples. Significant deviations from intuitive expectations are observed. Simulations based on an adapted Nyquist noise equation are used to understand and interpret the experimental findings. (C) 2009 Elsevier Inc. All rights reserved.