Optical pumping system design for large production of hyperpolarized 129Xe
Optical pumping system design for large production of hyperpolarized 129Xe
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DOI：
10.1103/physrevlett.96.053002
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发表时间：
2006-02-10
影响因子：
8.6
通讯作者：
Hersman, FW
中科院分区：
文献类型：
--
作者：
Ruset, IC;Ketel, S;Hersman, FW
我们提出了一个自旋交换光抽运系统的设计，以产生大量的高度极化的氘-129。流动气体混合物中的低氙浓度允许激光器保持高Rb偏振。Rb和Xe-129在低压下通过长寿命的货车德瓦耳斯分子的大自旋交换速率，加上高流速，导致超极化氙的大生产率。我们报告的最大极化为64%，实现了0.3升/小时的流速，最大磁化输出为6升/小时，在22%的极化。我们的研究结果有关的极化温度，氮气分压，和气体混合物的流速的依赖关系也报道。
We present a design for a spin-exchange optical pumping system to produce large quantities of highly polarized Xe-129. Low xenon concentrations in the flowing gas mixture allow the laser to maintain high Rb polarization. The large spin-exchange rate between Rb and Xe-129 through the long-lived van der Waals molecules at low pressure, combined with a high flow rate, results in large production rates of hyperpolarized xenon. We report a maximum polarization of 64% achieved for a 0.3 l/h Xe flow rate, and maximum magnetization output of 6 l/h at 22% polarization. Our findings regarding the polarization dependence on temperature, nitrogen partial pressure, and gas mixture flow velocity are also reported.