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A frequency-swept, longitudinal detection EPR system for measuring short electron spin relaxation times at ultra-low fields.
- Source :
-
Journal of magnetic resonance (San Diego, Calif. : 1997) [J Magn Reson] 2022 Sep; Vol. 342, pp. 107279. Date of Electronic Publication: 2022 Aug 01. - Publication Year :
- 2022
-
Abstract
- A frequency-swept longitudinal detection (LOD) EPR system is described for ultra-low field spectroscopy and relaxometry. With the capability of performing simultaneous transmit and receive with -80 dB isolation, this LOD-EPR can capture signals with decay constants in the nanosecond range and in theory even sub-nanosecond range, at fields close to the earth's magnetic field. The theoretical principles underlying this LOD-EPR are based on a fictitious field that accounts for the Z-axis magnetization polarized by a radiofrequency field alone. The electron spin relaxation time is obtained directly from a previously derived equation that describes the relationship between the relaxation time and the spectral peak position. Herein, the first frequency-swept LOD-EPR system is described in detail, along with experimental measurements of the short relaxation time (∼30 ns) of the free radical, 2,2-diphenyl-1-picrylhydrazyl, at zero to low field.<br />Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2022 Elsevier Inc. All rights reserved.)
- Subjects :
- Electron Spin Resonance Spectroscopy methods
Electrons
Subjects
Details
- Language :
- English
- ISSN :
- 1096-0856
- Volume :
- 342
- Database :
- MEDLINE
- Journal :
- Journal of magnetic resonance (San Diego, Calif. : 1997)
- Publication Type :
- Academic Journal
- Accession number :
- 35952409
- Full Text :
- https://doi.org/10.1016/j.jmr.2022.107279