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首页> 外文期刊>Applied Magnetic Resonance >EPR Uniform Field Signal Enhancement by Dielectric Tubes in Cavities
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EPR Uniform Field Signal Enhancement by Dielectric Tubes in Cavities

机译：EPR均匀的场信号通过介质管在空腔中提高

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摘要

The dielectric tube resonator (DTR) for electron paramagnetic resonance spectroscopy is introduced. It is defined as a metallic cylindrical TE011 microwave cavity that contains a dielectric tube centered on the axis of the cylinder. Contour plots of dimensions of the metallic cylinder to achieve resonance at 9.5 GHz are shown for quartz, sapphire, and rutile tubes as a function of wall thickness and average radius. These contour plots were developed using analytical equations and confirmed by finite-element modeling. They can be used in two ways: design of the metallic cylinder for use at 9.5 GHz that incorporates a readily available tube such as a sapphire tube intended for NMR and design of a custom procured tube for optimized performance for specific sample-size constraints. The charts extend to the limiting condition where the dielectric fills the tube. However, the structure at this limit is not a dielectric resonator due to the metal wall and does not radiate. In addition, the uniform field (UF) DTR is introduced. Development of the UF resonator starting with a DTR is shown. The diameter of the tube remains constant along the cavity axis, and the diameter of the cylindrical metallic enclosure increases at the ends of the cavity to satisfy the uniform field condition. This structure has advantages over the previously developed UF TE011 resonators: higher resonator efficiency parameter I >, convenient overall size when using sapphire tubes, and higher quality data for small samples. The DTR and UF DTR structures fill the gap between free space and dielectric resonator limits in a continuous manner.
机译：引入了电子顺磁谐振光谱的介质管谐振器（DTR）。它被定义为金属圆柱形TE011微波腔，其包含以圆柱体的轴线为中心的介电管。为壁厚和平均半径的函数示出了金属气缸以实现9.5GHz的谐振尺寸以实现9.5GHz的尺寸的轮廓图。这些轮廓图是使用分析方程式开发的，并通过有限元建模证实。它们可以两种方式使用：金属缸的设计，用于9.5 GHz，其包括易于获得的管，例如用于NMR的蓝宝石管，以及定制采购管的设计，用于优化特定样本尺寸约束的优化性能。图表延伸到电介质填充管的限制条件。然而，由于金属壁，该极限的结构不是介质谐振器并且不辐射。此外，介绍了统一字段（UF）DTR。显示了以DTR开始的UF谐振器的开发。管的直径沿着腔轴线保持恒定，并且圆柱形金属外壳的直径在腔的末端增加以满足均匀的场地条件。该结构具有通过先前开发的UF TE011谐振器的优点：较高的谐振器效率参数I>，使用蓝宝石管时，方便的整体尺寸，以及小型样品的更高质量数据。 DTR和UF DTR结构以连续方式填充自由空间和介质谐振器限制之间的间隙。

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