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@article{Šimėnas:2021:10.1016/j.jmr.2020.106876,
author = {imnas, M and OSullivan, J and Zollitsch, CW and Kennedy, O and Seif-Eddine, M and Ritsch, I and Hülsmann, M and Qi, M and Godt, A and Roessler, MM and Jeschke, G and Morton, JJL},
doi = {10.1016/j.jmr.2020.106876},
journal = {Journal of Magnetic Resonance},
pages = {1--7},
title = {A sensitivity leap for X-band EPR using a probehead with a cryogenic preamplifier},
url = {http://dx.doi.org/10.1016/j.jmr.2020.106876},
volume = {322},
year = {2021}
}

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TY  - JOUR
AB  - 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.
AU  - imnas,M
AU  - OSullivan,J
AU  - Zollitsch,CW
AU  - Kennedy,O
AU  - Seif-Eddine,M
AU  - Ritsch,I
AU  - Hülsmann,M
AU  - Qi,M
AU  - Godt,A
AU  - Roessler,MM
AU  - Jeschke,G
AU  - Morton,JJL
DO  - 10.1016/j.jmr.2020.106876
EP  - 7
PY  - 2021///
SN  - 1090-7807
SP  - 1
TI  - A sensitivity leap for X-band EPR using a probehead with a cryogenic preamplifier
T2  - Journal of Magnetic Resonance
UR  - http://dx.doi.org/10.1016/j.jmr.2020.106876
UR  - https://www.sciencedirect.com/science/article/pii/S1090780720301944?via%3Dihub
UR  - http://hdl.handle.net/10044/1/84780
VL  - 322
ER  -

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