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. 2023 Nov:356:107573.
doi: 10.1016/j.jmr.2023.107573. Epub 2023 Oct 13.

Q-band EPR cryoprobe

Vidmantas Kalendra  1 , Justinas Turčak  2 , Gediminas Usevičius  2 , Hugo Karas  3 , Miriam Hülsmann  4 , Adelheid Godt  4 , Gunnar Jeschke  3 , Jūras Banys  2 , John J L Morton  5 , Mantas Šimėnas  6
Affiliations
Free article

Q-band EPR cryoprobe

Vidmantas Kalendra et al. J Magn Reson. 2023 Nov.
Free article

Abstract

Following the success of cryogenic EPR signal preamplification at X-band, we present a Q-band EPR cryoprobe compatible with a standard EPR resonator. The probehead is equipped with a cryogenic ultra low-noise microwave amplifier and its protection circuit that are placed close to the sample in the same cryostat. Our cryoprobe maintains the same sample access and tuning which is typical in Q-band EPR, as well as supports high-power pulsed experiments on typical samples. The performance of our setup is benchmarked against that of existing commercial and home-built Q-band spectrometers, using CW EPR and pulsed EPR/ENDOR experiments to reveal a significant sensitivity improvement which reduces the measurement time by a factor of about 40× at 6 K temperature at reduced power levels.

Keywords: Cryoprobe; EPR; LNA; Noise; Q-band; Sensitivity.

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Conflict of interest statement

Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Mantas Šimėnas reports a relationship with Amplify My Probe Ltd. that includes: equity or stocks. Vidmantas Kalendra reports a relationship with Amplify My Probe Ltd. that includes: equity or stocks

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