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Uniform Field Resonators for EPR Spectroscopy: A Review

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Abstract

Cavity resonators are often used for electron paramagnetic resonance (EPR). Rectangular TE102 and cylindrical TE011 are common modes at X-band even though the field varies cosinusoidally along the Z-axis. The authors found a way to create a uniform field (UF) in these modes. A length of waveguide at cut-off was introduced for the sample region, and tailored end sections were developed that supported the microwave resonant mode. This work is reviewed here. The radio frequency (RF) magnetic field in loop-gap resonators (LGR) at X-band is uniform along the Z-axis of the sample, which is a benefit of LGR technology. The LGR is a preferred structure for EPR of small samples. At Q-band and W-band, the LGR often exhibits nonuniformity along the Z-axis. Methods to trim out this nonuniformity, which are closely related to the methods used for UF cavity resonators, are reviewed. In addition, two transmission lines that are new to EPR, dielectric tube waveguide and circular ridge waveguide, were recently used in UF cavity designs that are reviewed. A further benefit of UF resonators is that cuvettes for aqueous samples can be optimum in cross section along the full sample axis, which improves quantification in EPR spectroscopy of biological samples.

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Notes

  1. In this work, we define the static magnetic field (H0) to be along the X-axis and, therefore, the RF magnetic fields along Y-axis and Z-axis give rise to EPR transitions.

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Acknowledgements

This work was supported by grant P41 EB001980 from the National Institutes of Health. Jason W. Sidabras is currently funded by the European Union Horizon 2020 Marie Skłodowska-Curie Fellowship (Act-EPR; http://act-epr.org) and the Max Planck Society.

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Authors and Affiliations

  1. National Biomedical EPR Center, Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI, 53226, USA

    James S. Hyde, Jason W. Sidabras & Richard R. Mett

  2. Max Planck Institute for Chemical Energy Conversion, Department of Biophysical Chemistry, 45470, Mülheim an der Ruhr, Germany

    Jason W. Sidabras

  3. Department of Physics and Chemistry, Milwaukee School of Engineering, 1025 North Broadway, Milwaukee, WI, 53202, USA

    Richard R. Mett

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  1. James S. Hyde
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  2. Jason W. Sidabras
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Correspondence to James S. Hyde.

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Hyde, J.S., Sidabras, J.W. & Mett, R.R. Uniform Field Resonators for EPR Spectroscopy: A Review. Cell Biochem Biophys 77, 3–14 (2019). https://doi.org/10.1007/s12013-018-0845-6

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  • DOI: https://doi.org/10.1007/s12013-018-0845-6

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