通过原位低场核磁共振探测，利用自旋交换光泵浦实现氙“体”超极化的显著改善。
Dramatic improvement in the "Bulk" hyperpolarization of Xe via spin exchange optical pumping probed using in situ low-field NMR.
作者信息
Molway Michael J, Bales-Shaffer Liana, Ranta Kaili, Ball James, Sparling Eleanor, Prince Mia, Cocking Daniel, Basler Dustin, Murphy Megan, Kidd Bryce E, Gafar Abdulbasit Tobi, Porter Justin, Albin Kierstyn, Rosen Matthew S, Chekmenev Eduard Y, Michael Snow W, Barlow Michael J, Goodson Boyd M
机构信息
School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale 62901, IL, USA.
School of Medicine, University of Nottingham, Queens Medical Centre, Nottingham, UK.
出版信息
J Magn Reson. 2023 Sep;354:107521. doi: 10.1016/j.jmr.2023.107521. Epub 2023 Jul 10.
We report on hyperpolarization of quadrupolar (I=3/2) Xe via spin-exchange optical pumping. Observations of the Xe polarization dynamics via in situ low-field NMR show that the estimated alkali-metal/Xe spin-exchange rates can be large enough to compete with Xe spin relaxation. Xe polarization up to 7.6±1.5% was achieved in ∼8.5×10 spins-a ∼100-fold improvement in the total spin angular momentum-potentially enabling various applications, including: measurement of spin-dependent neutron-Xe s-wave scattering; sensitive searches for time-reversal violation in neutron-Xe interactions beyond the Standard Model; and surface-sensitive pulmonary MRI.
我们报道了通过自旋交换光泵浦实现四极（I = 3/2）氙的超极化。通过原位低场核磁共振对氙极化动力学的观察表明，估计的碱金属/氙自旋交换率足够大，足以与氙自旋弛豫相竞争。在约8.5×10个自旋中实现了高达7.6±1.5%的氙极化——总自旋角动量提高了约100倍——这有可能实现各种应用，包括：测量自旋相关的中子-氙s波散射；对超出标准模型的中子-氙相互作用中时间反演对称性破缺的灵敏搜索；以及表面敏感的肺部磁共振成像。
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