Magnetic field effect on the free induction decay of hydroxyl radicals (OH) in the terahertz region

Document Type

Article

Publication Date

9-28-2020

Abstract

The effect of an external longitudinal magnetic field on the optical free induction decay from a free radical is observed for the first time. The experiments were performed on a rotational transition of the hydroxyl radical, OH (2Π3/2(J = 1) ← 2Π3/2(J = 0) at 83.8 cm-1), using a terahertz free electron laser. In contrast to the results of the experiments with a stable paramagnetic molecule, NO, the observed effect of an external magnetic field on the free induction decay from hydroxyl radicals is more complicated. A longitudinal magnetic field leads to the rotation of the polarization plane of the FID radiation and to an additional modulation of the signal intensity. The angle of the rotation of the plane of polarization 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 the selective detection of weak signals of short-lived reactive paramagnetic free radicals from overwhelming signals that originate from stable non-paramagnetic species by polarization discrimination.

Identifier

85091548603 (Scopus)

Publication Title

Physical Chemistry Chemical Physics

External Full Text Location

https://doi.org/10.1039/d0cp02773a

ISSN

14639076

PubMed ID

32966402

First Page

20248

Last Page

20252

Issue

36

Volume

22

Grant

19-73-20060

Fund Ref

Russian Science Foundation

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