Design Considerations of a Dual Mode X-Band EPR Resonator for Rapid In-Situ Microwave Heating
Design Considerations of a Dual Mode X-Band EPR Resonator for Rapid In-Situ Microwave Heating
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用于快速原位微波加热的双模式 X 波段 EPR 谐振器的设计考虑
DOI:
10.1007/s00723-022-01463-1
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发表时间:
2022
影响因子:
1
通讯作者:
Barter M
中科院分区:
文献类型:
--
作者:
Barter M
This paper describes the design considerations for a dual mode X-band continuous wave (CW) Electron Paramagnetic Resonance (EPR) cavity, for simultaneous EPR measurement and microwave heating of the same sample. An elliptical cavity geometry is chosen to split the degeneracy of the TM110mode, allowing for a well resolved EPR signal with the TM110,aand TM110,bmodes resonating at around 10 GHz and 9.5 GHz, respectively, the latter of which is used for EPR measurements. This geometry has the benefit that the TM010mode used for microwave heating resonates at 6.1 GHz, below the cut off frequency of the X-band waveguide used for the EPR channel, providing effective isolation between the heating and EPR channels. The use of a pair of 9 µm thick copper clad laminates as the flat cavity walls allows for sufficient penetration of the modulation field (Bmod) into the cavity, as well as maintaining a high cavity Q factor (> 5700) for sensitive EPR measurements. Locating the heating port at an angle of 135° to the EPR port provides additional space for easier coupling adjustment and for larger sample access to be accommodated. The associated decrease of EPR signal strength is fully compensated for by using a 7.2 GHz low pass filter on the heating port. EPR spectra using 1.6 mm and 4.0 mm sample tubes are shown at room temperature (298 K) and 318 K for a standard Cu(acac)2solution, demonstrating the effectiveness of this dual-mode EPR cavity for microwave heating during EPR detection.
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