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首页> 外文期刊>Journal of magnetic resonance >Single-Shot Diffusion Measurement in Laser-Polarized Gas
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Single-Shot Diffusion Measurement in Laser-Polarized Gas

机译:激光极化气体中的单次扩散扩散测量

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摘要

A single-shot pulsed gradient stimulated echo sequence is introduced to address the challenges of diffusion measurements of laser polarized ~3He and ~(129)Xe gas. Laser polarization enhances the NMR sensitivity of theses noble gases by > 10~3, but creates an unstable, nonthermal polarization that is not readily renewable. A new method is presented which permits parallel acquisition of the several measurements required to determine a diffusive attenuation curve. The NMR characterization of a sample's diffusion behavior can be accomplished in a single measurement, using only a single polarization step. As a demonstration, the diffusion coefficient of a sample of laser-polarized ~(129)Xe gas is measured via this method.
机译:引入了单脉冲脉冲梯度激发回波序列,以解决激光偏振〜3He和〜(129)Xe气体扩散测量的挑战。激光极化将这些稀有气体的NMR灵敏度提高了10〜3以上,但产生了不稳定的非热极化,不易再生。提出了一种新方法,该方法允许并行获取确定扩散衰减曲线所需的几个测量值。样品扩散行为的NMR表征可以仅使用一个极化步骤在一次测量中完成。作为演示,通过这种方法测量了激光偏振的〜(129)Xe气体样品的扩散系数。

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