260 GHz quasioptical setup for EPR and DNP experiments on the 9.2 Tesla DNP/NMR/EPR spectrometer

V. Denysenkov, V. K. Kiseliov, M. Prandolini, M. Gafurov, A. Krahn, F. Engelke, V. Bezborodov, Y. Kuleshov, P. Nesterov, M. S. Yanovsky, T. Prisner
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引用次数: 4

Abstract

Transmission of microwave signals under low-losses conditions is highly demanding task in sub-mm EPR and DNP spectroscopy. We have designed and built a quasioptical setup in the Michelson interferometer configuration using oversized metallo-dielectric waveguides (MDW) of a square-shape cross-section and components such as attenuators, beam splitters, wavemeter, tapers to fundamental TE10 mode which have extremely low losses in sub-mm wave range. Following features of the setup such as total transmission losses below 2 dB from the source port to a resonator with a sample inside the cryomagnet; fine balance tuning between signal and reference channels affording up to 36 dB background signal suppression, linear-to-circular polarization conversion with a possibility to tune its phase, which allows effective suppression of reflected signal with respect to induction signal; switching between two microwave sources; and high power handling up to 20 Watt helped to reach high performance of the 9.2 Tesla DNP/NMR/EPR spectrometer. First liquid-state DNP results on nitroxide radicals in water will be presented.
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在9.2特斯拉DNP/NMR/EPR光谱仪上进行EPR和DNP实验的260 GHz准光学装置
在亚毫米EPR和DNP光谱中,在低损耗条件下传输微波信号是一项要求很高的任务。我们在迈克尔逊干涉仪配置中设计并构建了一个准光学装置,使用方形截面的超大金属介电波导(MDW)和衰减器,分束器,波长计,锥度等组件,在亚毫米波范围内具有极低的损耗。该装置的以下特征,例如从源端口到具有低温磁铁内部样品的谐振器的总传输损耗低于2db;信号和参考通道之间的精细平衡调谐提供高达36 dB的背景信号抑制,线性到圆偏振转换,可以调整其相位,这使得反射信号相对于感应信号有效抑制;在两个微波源之间切换;高达20瓦的高功率处理有助于实现9.2特斯拉DNP/NMR/EPR光谱仪的高性能。第一个液态DNP结果在水中的氮氧化物自由基将被提出。
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