Šimėnas, M;
O'Sullivan, J;
Zollitsch, CW;
Kennedy, O;
Seif-Eddine, M;
Ritsch, I;
Hülsmann, M;
... Morton, JJL; + view all
(2021)
A sensitivity leap for X-band EPR using a probehead with a cryogenic preamplifier.
Journal of Magnetic Resonance
, 322
, Article 106876. 10.1016/j.jmr.2020.106876.
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Abstract
Inspired by the considerable success of cryogenically cooled NMR cryoprobes, we present an upgraded X-band EPR probehead, equipped with a cryogenic low-noise preamplifier. Our setup suppresses source noise, can handle the high microwave powers typical in X-band pulsed EPR, and is compatible with the convenient resonator coupling and sample access found on commercially available spectrometers. Our approach allows standard pulsed and continuous-wave EPR experiments to be performed at X-band frequency with significantly increased sensitivity compared to the unmodified setup. The probehead demonstrates a voltage signal-to-noise ratio (SNR) enhancement by a factor close to 8× at a temperature of 6 K, and remains close to 2× at room temperature. By further suppressing room-temperature noise at the expense of reduced microwave power (and thus minimum -pulse length), the factor of SNR improvement approaches 15 at 6 K, corresponding to an impressive 200-fold reduction in EPR measurement time. We reveal the full potential of this probehead by demonstrating such SNR improvements using a suite of typical hyperfine and dipolar spectroscopy experiments on exemplary samples.
| Type: | Article |
|---|---|
| Title: | A sensitivity leap for X-band EPR using a probehead with a cryogenic preamplifier |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jmr.2020.106876 |
| Publisher version: | https://doi.org/10.1016/j.jmr.2020.106876 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | DEER, EPR, HYSCORE, Preamplifier, Probehead, SNR enhancement |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10117477 |
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