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nmrlearner 12-06-2017 11:04 PM

A sub-Kelvin cryogen-free EPR system
 
From The DNP-NMR Blog:

A sub-Kelvin cryogen-free EPR system

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This article has nothing to do with DNP. However, the article nicely describes an impressive piece of isntrumentation to reach very low temperatures.




Melhuish, S.J., et al., A sub-Kelvin cryogen-free EPR system. J. Magn. Reson., 2017. 282(Supplement C): p. 83-88.


http://www.sciencedirect.com/science...90780717301829


We present an EPR instrument built for operation at Q band below 1K. Our cryogen-free Dewar integrates with a commercial electro-magnet and bridge. A description of the cryogenic and RF systems is given, along with the adaptations to the standard EPR experiment for operation at sub-Kelvin temperatures. As a first experiment, the EPR spectra of powdered Cr12O9(OH)3(O2CCMe3)15 were measured. The sub-Kelvin EPR spectra agree well with predictions, and the performance of the sub-Kelvin system at 5K is compared to that of a commercial spectrometer.
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Go to The DNP-NMR Blog for more info.


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