Experimental cell with a Fabry–Pérot resonator tuned in situ for magnetic resonance studies of matrix-isolated radicals at temperatures below 1 K
Abstract
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–Pérot design, and its frequency can be tuned in situ by 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 01, 2020
- Source ID
- 10.1063/5.0012178
Entities
People
- D. M. Lee
- Janne Ahokas
- Jarno Järvinen
- S. Vasiliev
- Sergei Sheludiakov
- Vladimir V Khmelenko
Organizations
- National Science Foundation
- Office of Naval Research
- Research Council of Finland
- Texas A&M University
- University of Turku