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Isotope shift of nuclear magnetic resonances in 129Xe and 131Xe caused by spin-exchange pumping by alkali metal atoms
IEEE Sensors Journal ( IF 4.3 ) Pub Date : 2020-01-15 , DOI: 10.1109/jsen.2019.2945002
Vladimir I. Petrov , Anatoly S. Pazgalev , Anton K. Vershovskii

The effect of isotope shifts of nuclear magnetic resonance (NMR) frequency in xenon isotopes 129Xe and 131Xe polarized by optically-oriented alkali metal atoms is not only of fundamental interest, but also of practical significance, since it is the main factor limiting the accuracy of a whole class of prospective navigation and metrological devices. Our study of the parametric dependences of the isotope shift has shown that this effect is largely due to incomplete averaging of an inhomogeneous local magnetic field by two xenon isotopes, and therefore, its value can be influenced by applying an external magnetic field gradient. A numerical model is derived that qualitatively describes the effect of the isotopic frequency shift, as well as its dependence on the cell temperature and the external magnetic field gradient. The model provides a good quantitative agreement with the experiment – e.g., at a temperature of 85°C, the isotope shift values predicted by the model coincide with experimental data with an accuracy of up to the experimental error, which, in turn, does not exceed 8% of the total change in the isotopic shift in the entire range of applied magnetic field gradients.

中文翻译:

碱金属原子自旋交换泵浦引起 129Xe 和 131Xe 核磁共振的同位素位移

由光学定向碱金属原子极化的氙同位素 129Xe 和 131Xe 中核磁共振 (NMR) 频率的同位素位移的影响不仅具有根本意义,而且具有实际意义,因为它是限制精度的主要因素。一整类前瞻性的导航和计量设备。我们对同位素位移的参数依赖性的研究表明,这种效应主要是由于两个氙同位素对不均匀局部磁场的不完全平均,因此,它的值会受到施加外部磁场梯度的影响。导出的数值模型定性地描述了同位素频移的影响,以及它对细胞温度和外部磁场梯度的依赖性。
更新日期:2020-01-15
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