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首页> 外文期刊>Japanese journal of applied physics >Optical-Pumping Double-Nuclear-Magnetic-Resonance System with a Gifford-McMahon Cryocooler
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Optical-Pumping Double-Nuclear-Magnetic-Resonance System with a Gifford-McMahon Cryocooler

机译:带有Gifford-McMahon低温冷却器的光泵浦双核磁共振系统

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摘要

We have developed a system for performing optical-pumping and double-resonance NMR of semiconductors simultaneously or sequentially. The components include a cryosystem equipped with a Gifford-McMahon (GM) cryocooler, which cools the samples via thermal contact. The following benefits are derived from this feature. (1) A pickup coil and tank circuits for NMR can be built in a vacuum, which excludes rf discharges and/or arcing (breakdown) occurring in conventional systems employing a helium-gas atmosphere, allowing application of the stronger and more stable rf-pulses required for broad-line double-resonance NMR. (2) Heat around a sample generated by light irradiation can be drained through the thermal connection to a heat anchor, permitting the use of a light-power high enough to achieve large nuclear polarization by optical pumping. (3) A bottom-loading style can be adopted for the installation of a cryostat and a probe to an NMR magnet, allowing a more compact system.
机译:我们已经开发了一种用于同时或顺序执行半导体的光泵浦和双共振NMR的系统。这些组件包括配备有Gifford-McMahon(GM)低温冷却器的低温系统,该系统通过热接触冷却样品。此功能带来以下好处。 (1)可以在真空中构建用于NMR的拾波线圈和储能电路,这不包括使用氦气气氛的常规系统中发生的rf放电和/或电弧放电(击穿),从而允许使用更坚固,更稳定的rf-宽谱双共振NMR所需的脉冲数。 (2)由光辐射产生的样品周围的热量可以通过与热锚的热连接排出,从而允许使用足够高的光功率以通过光泵浦实现大的核极化。 (3)对于低温恒温器和NMR磁体的探头,可以采用底部装载的方式,从而使系统更加紧凑。

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  • 来源
    《Japanese journal of applied physics》 |2011年第12期|p.126701.1-126701.5|共5页
  • 作者单位

    National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan,PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan;

    National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan;

    National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan;

    National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan;

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