Non-Faraday rotation of the free induction decay of hydroxyl radical in terahertz region

E. N. Chesnokov, V. V. Kubarev, L. N. Krasnoperov, P. V. Koshlyakov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Effect of external longitudinal magnetic field on the optical Free Induction Decay (FID) from a free radical was observed for the first time. The experiments were performed on the rotational transition of hydroxyl radical OH (233/2(J=1) Å 233/2(J=0) at 83.8 cmí1) using the Terahertz Free Electron Laser. In contrast to the results of the experiments with a stable paramagnetic molecule NO, the observed effect of external magnetic field on the Free Induction Decay from hydroxyl radicals is more complicated. A longitudinal magnetic field leads to rotation of the polarization plane of the FID radiation, as well as to additional modulation of the signal intensity. The angle of rotation of the polarization plane is large, in agreement with the theoretical predictions. The observed FID kinetics in the time domain are in semi-quantitative agreement with the modeling. This observation opens an opportunity for selective detection by polarization discrimination of weak signals of short-lived reactive paramagnetic free radicals from overwhelming signals that originate from stable non-paramagnetic species.

Original languageEnglish (US)
Title of host publicationSynchrotron and Free Electron Laser Radiation
Subtitle of host publicationGeneration and Application, SFR 2020
EditorsBoris Knyazev, Nikolay Vinokurov
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735440333
DOIs
StatePublished - Nov 17 2020
Event2020 Internetional Conference on Synchrotron and Free Electron Laser Radiation: Generation and Application, SFR 2020 - Novosibirsk, Russian Federation
Duration: Jul 13 2020Jul 16 2020

Publication series

NameAIP Conference Proceedings
Volume2299
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference2020 Internetional Conference on Synchrotron and Free Electron Laser Radiation: Generation and Application, SFR 2020
Country/TerritoryRussian Federation
CityNovosibirsk
Period7/13/207/16/20

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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