用于EPR光谱学的高频单模谐振器，能够使样品绕两个正交轴旋转
High frequency single-mode resonators for EPR spectroscopy enabling rotations of the sample about two orthogonal axes
摘要：
一种新的单模共振结构，使旋转的样品围绕两个正交轴的电子顺磁共振应用进行了研究。所提出的解决方案是基于圆柱形无辐射谐振器横向加载的样品架。所得到的结构仍然可以在非辐射状态下工作，尽管不再是旋转不变的。这些理论预测，基于对称性的考虑，通过有限元数值模拟证实。理论和计算结果，然后证实在毫米波长的实验研究。其结果是，一个单模谐振器，使所有相关的旋转的样品是在毫米波长的第一次证明。在该谐振器中，样品上的微波场的强度及其相对于静态磁场的取向在旋转期间可以保持恒定。因此，各向异性系统的完整表征是可能的，在最高的灵敏度，而不需要分裂线圈磁铁。在很高的频率可能的应用进行了讨论。
英文摘要：
A novel single-mode resonant structure which enables the rotation of the sample about two orthogonal axes is investigated in view of electron paramagnetic resonance applications. The proposed solution is based on cylindrical nonradiative resonators laterally loaded by the sample holder. The resulting structure can still operate in nonradiative regime, although no longer rotationally invariant. These theoretical predictions, based on symmetry considerations, are confirmed by means of a finite element numerical modelling. Theoretical and computational results are then substantiated by experimental investigations at millimeter wavelengths. As a result, a single-mode resonator which enables all the relevant rotations of the sample is demonstrated at millimeter wavelengths for the first time. In this resonator the intensity of the microwave field on the sample and its orientation with respect to the static magnetic field can be kept constant during the rotations. Therefore, a complete characterization of anisotropic systems is possible at the highest sensitivity, without the need of split-coil magnets. Possible applications at very high frequencies are discussed.
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