Q-band EPR cryoprobe

被引：1
|
作者：
Kalendra, Vidmantas [1 ,2 ]
Turcak, Justinas [1 ]
Usevicius, Gediminas [1 ]
Karas, Hugo [3 ]
Huelsmann, Miriam [4 ,5 ]
Godt, Adelheid [4 ,5 ]
Jeschke, Gunnar [3 ]
Banys, Juras [1 ]
Morton, John J. L. [6 ,7 ]
Simenas, Mantas [1 ]
机构：
[1] Vilnius Univ, Fac Phys, Sauletekio 3, LT-10257 Vilnius, Lithuania
[2] Amplify My Probe Ltd, London NW1 1NJ, England
[3] Swiss Fed Inst Technol, Dept Chem & Appl Biosci, Vladimir Prelog Weg 1-5-10, CH-8093 Zurich, Switzerland
[4] Bielefeld Univ, Fac Chem, Univ Str 25, D-33615 Bielefeld, Germany
[5] Bielefeld Univ, Ctr Mol Mat CM2, Univ Str 25, D-33615 Bielefeld, Germany
[6] UCL, London Ctr Nanotechnol, London WC1H 0AH, England
[7] UCL, Dept Elect & Elect Engn, London WC1E 7JE, England
来源：
JOURNAL OF MAGNETIC RESONANCE | 2023年 / 356卷
基金：
欧洲研究理事会; 英国工程与自然科学研究理事会;
关键词：
EPR; Cryoprobe; Q-band; LNA; Sensitivity; Noise; RESONANCE SPECTROMETER; ELECTRON; PROBES;
D O I：
10.1016/j.jmr.2023.107573
中图分类号：
Q5 [生物化学];
学科分类号：
071010 ; 081704 ;
摘要：
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 40x at 6 K temperature at reduced power levels.
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页数：6
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