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Q-Band Loop-Gap Resonator for EPR Applications with Broadband-Shaped Pulses

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Abstract

Recently, Q-band-pulsed electron paramagnetic resonance spectroscopy has strongly advanced its performance by the introduction of high-power microwave amplifiers and the use of shaped pulses. For such applications, the resonator Q value has to be low enough to achieve sufficient bandwidth for short microwave pulses and to reduce the ring-down time after the pulses. However, a low Q value reduces the detection sensitivity as well as the conversion efficiency of the microwave input power to the magnetic field strength at the sample position. Therefore, the resonator Q value has to be optimized for a given microwave input power and specific application. We designed a three-loop/two-gap resonator using CST Microwave Studio for such applications, and tested its performance in comparison with a standard Bruker D2 Q-band microwave resonator by accomplishing broadband SIFTER experiments on a nitroxide model compound.

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Acknowledgements

We thank the German Research Society (DFG) for financial support via the Priority Program New Frontiers in Sensitivity for EPR Spectroscopy (SPP 1601).

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Authors and Affiliations

  1. Institute of Physical and Theoretical Chemistry, Center of Biomolecular Magnetic Resonance, Goethe University Frankfurt, Frankfurt am Main, Germany

    Vasyl Denysenkov, Philipp van Os & Thomas F. Prisner

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  1. Vasyl Denysenkov
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  2. Philipp van Os
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  3. Thomas F. Prisner
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Correspondence to Thomas F. Prisner.

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Denysenkov, V., van Os, P. & Prisner, T.F. Q-Band Loop-Gap Resonator for EPR Applications with Broadband-Shaped Pulses. Appl Magn Reson 48, 1263–1272 (2017). https://doi.org/10.1007/s00723-017-0930-9

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  • DOI: https://doi.org/10.1007/s00723-017-0930-9

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