Sample Holders for Sub-THz Electron Spin Resonance Spectroscopy
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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.
KeywordsOptical 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)
Document typePeer reviewed
Document versionFinal PDF
SourceIEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT. 2022, vol. 71, issue 1, p. 1-12.