Sample Holders for Sub-THz Electron Spin Resonance Spectroscopy

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT(2022)

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Abstract
Electron spin resonance (ESR) is a powerful spectroscopic technique used to investigate samples with unpaired electrons in a broad range of scientific fields. High-frequency ESR (HF-ESR) spectrometers operating at sub-THz frequencies are mostly custom-made with non-standard solutions. This article presents a set of six different exchangeable sample holders with a fast-loading flange for a sub-THz ESR spectrometer operating at high magnetic fields up to 16 T and temperature ranges of 4-400 K. Here, we report on the concept, design, and illustrative measurements of non-resonant ESR sample holders for the measurements of samples in a liquid solution, polycrystalline-compressed powders, oriented single crystals, electrical devices under sub-THz irradiation, as well as for samples transferred from the ultrahigh vacuum (UHV) systems without air contamination. Our solution expands the usage possibilities for HF-ESR spectroscopy, showing that one spectrometer with the presented concept of sample holders enables a wide range of applications.
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Key words
Optical waveguides,Connectors,Pollution measurement,Magnetic resonance,Temperature measurement,Probes,Magnetic field measurement,Frequency-domain magnetic resonance (FDMR),high-field,high-frequency electron spin resonance (ESR),EPR,high-frequency (HF) EPR,liquids,rapid scan (RS) ESR,single-crystal,ultrahigh vacuum (UHV)
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