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首页> 外文期刊>Review of Scientific Instruments >Magnetic Double Resonance Spectrometer for Dynamic Nuclear Polarization and Relaxation Time Measurements at 175 G
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Magnetic Double Resonance Spectrometer for Dynamic Nuclear Polarization and Relaxation Time Measurements at 175 G

机译：磁共振双共振光谱仪，用于在175 G下动态核极化和弛豫时间的测量

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摘要

A magnetic nuclear‐electron double resonance spectrometer operating in magnetic fields of about 175 G is described. It is suited for measurements of dynamic nuclear polarization and relaxation times in proton and fluorine containing solvents. The NMR spectrometer is a Q‐meter device synchronized by a crystal oscillator. The uhf setup for the saturation of the ESR lines consists of a frequency multiplied driver stage and a 493 Mc power stage. The sample is placed inside a quarter wavelength coaxial cavity with the NMR coil around it. A rapid modulation technique allows u‐mode detection and convenient comparison of NMR signals with and without ESR irradiation. The nuclear relaxation times (T2) are measured by observing the decay of the magnetization brought into the x,y plane by an adiabatic passage in the presence of a strong rf field. The performance is demonstrated with examples of proton polarization studies in organic solutions of free radicals.
机译：描述了一种在大约175 G的磁场中运行的核磁共振双共振光谱仪。它适用于测量质子和含氟溶剂中的动态核极化和弛豫时间。 NMR光谱仪是由晶体振荡器同步的Q仪设备。 ESR线饱和的超高频设置包括一个倍频驱动器级和一个493 Mc功率级。将样品放置在四分之一波长同轴腔内，并带有NMR线圈。快速调制技术允许在有或没有ESR辐射的情况下进行u模式检测并方便地比较NMR信号。核弛豫时间（T2）通过观察在强rf场存在下通过绝热通道进入x，y平面的磁化强度的衰减来测量。通过在自由基有机溶液中进行质子极化研究的实例证明了该性能。

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