A sub-Kelvin cryogen-free EPR system

Simon J Melhuish; Chloe Stott; Ana-Maria Ariciu; Lorenzo Martinis; Mark McCulloch; Lucio Piccirillo; David Collison; Floriana Tuna; Richard Winpenny

doi:10.1016/j.jmr.2017.07.007

A sub-Kelvin cryogen-free EPR system

J Magn Reson. 2017 Sep:282:83-88. doi: 10.1016/j.jmr.2017.07.007. Epub 2017 Jul 20.

Authors

Simon J Melhuish¹, Chloe Stott², Ana-Maria Ariciu², Lorenzo Martinis³, Mark McCulloch³, Lucio Piccirillo³, David Collison², Floriana Tuna², Richard Winpenny²

Affiliations

¹ Jodrell Bank Centre for Astrophysics, Alan Turing Building, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom. Electronic address: Simon.Melhuish@manchester.ac.uk.
² School of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, United Kingdom.
³ Jodrell Bank Centre for Astrophysics, Alan Turing Building, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom.

PMID: 28783525
DOI: 10.1016/j.jmr.2017.07.007

Abstract

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 [Formula: see text] 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.

Keywords: Cryogen-free; EPR; Sub-Kelvin.

Publication types

Research Support, Non-U.S. Gov't