Asymmetric NMR lineshapes and precision magnetometry
Asymmetric NMR lineshapes and precision magnetometry
复制标题
非对称 NMR 线形和精密磁力测量
DOI：
10.1088/0957-0233/7/4/028
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发表时间：
1996
影响因子：
2.4
通讯作者：
B. Cowan
中科院分区：
文献类型：
--
作者：
B. Cowan
在不对称分布的不均匀磁场中，观察到的液体 NMR 进动频率将随时间变化。我们表明，初始频率对应于吸收光谱的平均值，而最终进动频率对应于光谱的峰值。精密磁力测量需要了解平均值，以便可靠地外推到频率的零时间值。我们证明，与核磁共振谱线变窄一样，原子运动的影响是导致进动频率以指数方式松弛。这些结果的重要性在用于精密磁力测量的水中质子磁共振和气态核磁共振的比较中进行了讨论。
In an inhomogeneous magnetic field of asymmetric distribution the observed NMR precession frequency of a liquid will vary with time. We show that the initial frequency corresponds to the mean of the absorption spectrum whereas the final precession frequency corresponds to the peak of the spectrum. Precision magnetometry requires knowledge of the mean so that reliable extrapolation to the zero-time value of the frequency is required. We demonstrate that, as with the narrowing of NMR lines, the effect of atomic motion is to cause the precession frequency to relax in an exponential manner. The importance of these results is discussed in the comparison of proton magnetic resonance in water and NMR in gaseous for precision magnetometry.