基于法布里-珀罗谐振腔的W波段电子顺磁共振探头研制
收稿日期: 2024-04-19
网络出版日期: 2024-06-11
基金资助
国家自然科学基金资助项目(12150010)
A W-Band Electron Paramagnetic Resonance Probe Based on Fabry-Perot Cavity
Received date: 2024-04-19
Online published: 2024-06-11
本文研制了一种基于法布里-珀罗谐振腔的W波段电子顺磁共振探头．利用法布里-珀罗谐振腔所具备的大体积和开放腔等特点，本文将法布里-珀罗谐振腔用作谱仪探头的谐振器部分，并且设计了波纹波导来实现微波桥与法布里-珀罗谐振腔之间的低损耗微波信号传输．所研制的探头工作在W波段，空载品质因数为1 542．最终将该探头集成于W波段电子顺磁共振谱仪，通过测量Mn（II）掺杂的CaO粉末样品的谱线，展示了该探头在常温下用于W波段连续波电子顺磁共振实验的能力．探头的调制场频率设置为100 kHz，实验结果显示探头的最大调制场幅度可达8.9 G（1 G=10-4 T），谱仪绝对自旋数灵敏度为6.6×108 spins/(G•
罗文尤 , 荣星 . 基于法布里-珀罗谐振腔的W波段电子顺磁共振探头研制[J]. 波谱学杂志, 2024 , 41(4) : 393 -404 . DOI: 10.11938/cjmr20243111
This paper presents a new W-band electron paramagnetic resonance (EPR) probe design based on Fabry-Perot cavity. In this probe, a Fabry-Perot cavity with open structure and large effective volume is used as a resonator. Corrugated waveguides are designed to achieve low-loss microwave signal transmission between the W-band microwave bridge and the Fabry-Perot cavity. The probe works in W-band, and the unloaded quality factor is 1 542. A room-temperature continuous wave EPR experiment with Mn(II) in CaO powder was conducted after assembling the probe into a W-band EPR spectrometer. The results show that the modulation field amplitude is 8.9 G (1 G=10-4 T) when the modulation field frequency is set to 100 kHz, and the absolute spin sensitivity is estimated to be 6.6×108 spins/(G•
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