Pushing the sensitivity boundaries of X-band EPR cryoprobe using a fast microwave switch

IF 2.624
Uršulė Tarvydytė , Vidmantas Kalendra , Gediminas Usevičius , James O’Sullivan , Adam Brookfield , Alice M. Bowen , Jūras Banys , John J.L. Morton , Mantas Šimėnas
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Abstract

We present a new design of an X-band EPR cryoprobe based on a fast microwave switch and a cryogenic low-noise microwave amplifier that are placed close to the sample in the same cryostat. The probehead supports high-power (100 W) pulsed EPR experiments and is compatible with standard EPR resonators and samples. In contrast to the directional coupler design of the EPR cryoprobe reported previously, the fast microwave switch fully isolates the microwave amplifier from input thermal noise without microwave power suppression allowing us to approach the sensitivity limit of cryoprobes for pulsed EPR experiments. We benchmark the performance of our cryoprobe setup against a standard commercial EPR instrument revealing a significant sensitivity improvement, which reduces the measurement time by a factor of about 250× at 6 K sample temperature. We also show that the sensitivity of our new X-band cryoprobe design matches that of a standard Q-band setup for double electron–electron resonance experiments.

Abstract Image

利用快速微波开关突破x波段EPR低温探针的灵敏度极限
我们提出了一种基于快速微波开关和低温低噪声微波放大器的x波段EPR低温探针的新设计,这两个开关和低温低噪声微波放大器放置在同一低温恒温器中靠近样品的位置。探头支持高功率(100 W)脉冲EPR实验,并与标准EPR谐振器和样品兼容。与之前报道的EPR冷冻探针的定向耦合器设计相比,快速微波开关完全隔离了微波放大器与输入热噪声的影响,而不需要微波功率抑制,使我们接近脉冲EPR实验中冷冻探针的灵敏度极限。我们将冷冻探针设置的性能与标准商用EPR仪器进行了基准测试,结果显示灵敏度显着提高,在6 K样品温度下将测量时间减少了约250倍。我们还表明,我们的新x波段冷冻探针设计的灵敏度与双电子-电子共振实验的标准q波段装置相匹配。
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CiteScore
1.90
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