A1 Refereed original research article in a scientific journal
Experimental cell with a Fabry-Perot resonator tuned in situ for magnetic resonance studies of matrix-isolated radicals at temperatures below 1 K
Authors: Sheludiakov S, Lee DM, Khmelenko VV, Järvinen J, Ahokas J, Vasiliev S
Publisher: AMER INST PHYSICS
Publication year: 2020
Journal: Review of Scientific Instruments
Journal name in source: REVIEW OF SCIENTIFIC INSTRUMENTS
Journal acronym: REV SCI INSTRUM
Article number: ARTN 063901
Volume: 91
Issue: 6
Number of pages: 9
ISSN: 0034-6748
eISSN: 1089-7623
DOI: https://doi.org/10.1063/5.0012178
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/48890413
We describe the design and construction of an experimental cell for the study of free radicals in macroscopically thick films of solidified molecular and rare gases by 128 GHz Electron Spin Resonance (ESR) at temperatures below 1 K. The ESR resonator has an open Fabry-Perot design, and its frequency can be tunedin situby adjusting the spacing between the mirrors. The tuning mechanism consists of a piezo positioner and a stainless-steel edge-welded bellows, which can change the resonator frequency by at least 6 GHz. The films of solidified gases can be deposited either directly from a room temperature reservoir or by recondensing from a specially arranged chamber. The free radicals can be created in the solid films by dissociating matrix species by running an rf discharge in a helium vapor. We suggest that such a sample cell design can also be used for a broad range of low-temperature ESR experiments where sample cooling needs to be enhanced by the presence of superfluid helium.
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