Sensitive and selective detection of OH radicals using Faraday rotation spectroscopy at 28 µm | Zendy

Weixiong Zhao | Zendy; Gerard Wysocki | Zendy; Weidong Chen | Zendy; Éric Fertein | Zendy; David Le Coq | Zendy; Denis Petitprez | Zendy; Weijun Zhang | Zendy

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Sensitive and selective detection of OH radicals using Faraday rotation spectroscopy at 28 µm

Author(s) -

Weixiong Zhao,

Gerard Wysocki,

Weidong Chen,

Éric Fertein,

David Le Coq,

Denis Petitprez,

Weijun Zhang

Publication year - 2011

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.19.002493

Subject(s) - faraday effect , spectroscopy , optics , radical , detection limit , materials science , tunable diode laser absorption spectroscopy , laser , absorption spectroscopy , analytical chemistry (journal) , tunable laser , physics , chemistry , magnetic field , organic chemistry , chromatography , quantum mechanics

We report on the development of a Faraday rotation spectroscopy (FRS) instrument using a DFB diode laser operating at 2.8 µm for the hydroxyl (OH) free radical detection. The highest absorption line intensity and the largest gJ value make the Q (1.5) double lines of the 2Π3/2 state (υ = 1 ← 0) at 2.8 µm clearly the best choice for sensitive detection in the infrared region by FRS. The prototype instrument shows shot-noise dominated performance and, with an active optical pathlength of only 25 cm and a lock-in time constant of 100 ms, achieves a 1σ detection limit of 8.2 × 10(8) OH radicals/cm3.

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