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NMR Spectra of Cesium in Aqueous Solutions. Determination of the Magnetic Moment of Cesium-133 Nucleus

  • FUNDAMENTAL PROBLEMS IN METROLOGY
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The paper considers the issue of accuracy improvement in determining the magnetic moment of the cesium-133 nucleus used as a reference for evaluating the magnetic properties of short-lived cesium isotopes. In the study, the resonant frequency ratios of water protons to cesium-133 nuclei were experimentally obtained for the aqueous solutions of CsF, CsCl, and CsNO3 at concentrations of 0.1–0.4 mol/kg H2O. The simultaneous detection of nuclear magnetic resonance signals from water protons and cesium-133 nuclei was shown to minimize random and systematic uncertainties in determining the resonant frequency ratio between water protons and cesium to eight decimal places. In addition, the cesium salt content in water was extrapolated to zero concentrations. For single cesium ions in water, the ratio of resonant frequencies reached 7.6241815(2). The magnetic moment of the cesium-133 nucleus, amounting to 2.58243(12), was calculated taking into account data on the proton magnetic moment, as well as the shielding of protons and cesium ions in water, to be compared with the data of other authors. The studied aqueous solutions of cesium salts revealed an extremely high dependence between the resonant frequency of cesium nuclei and the solution temperature, which is 12 times higher than a similar dependence of water proton resonant frequency.

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Authors and Affiliations

  1. Mendeleev All-Russian Research Institute of Metrology, St. Petersburg, Russia

    Yu. I. Neronov & A. N. Pronin

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  1. Yu. I. Neronov
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  2. A. N. Pronin
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Correspondence to Yu. I. Neronov.

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Translated from Izmeritel’naya Tekhnika, No. 11, pp. 3–7, November, 2021.

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Neronov, Y.I., Pronin, A.N. NMR Spectra of Cesium in Aqueous Solutions. Determination of the Magnetic Moment of Cesium-133 Nucleus. Meas Tech 64, 865–870 (2022). https://doi.org/10.1007/s11018-022-02016-5

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  • DOI: https://doi.org/10.1007/s11018-022-02016-5

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