A 25 mm diameter 250 MHz crossed-loop resonator was designed for rapid scan electron paramagnetic resonance imaging. It has a saddle coil for the driven resonator and a fine wire, loop gap resonator for the sample resonator. There is good separation of E and B fields and high isolation between the two resonators, permitting a wide range of sample types to be measured. Applications to imaging of nitroxide, trityl, and LiPc samples illustrate the utility of the resonator. Using this resonator and a trityl sample the signal-to-noise of a rapid scan absorption spectrum is about 20 times higher than for a first-derivative CW spectrum.

中文翻译：

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250 MHz 快速扫描交叉环路谐振器

设计了一个直径为 25 mm 的 250 MHz 交叉回路谐振器，用于快速扫描电子顺磁共振成像。它有一个用于驱动谐振器的鞍形线圈和一个用于样品谐振器的细线环隙谐振器。E 场和 B 场的良好分离以及两个谐振器之间的高隔离度，允许测量范围广泛的样品类型。硝基氧、三苯甲基和 LiPc 样品成像的应用说明了谐振器的实用性。使用此谐振器和三苯甲基样品，快速扫描吸收光谱的信噪比比一阶导数 CW 光谱高约 20 倍。