Sensitive and selective detection of OH radicals using Faraday rotation spectroscopy at 2.8 μm

Weixiong Zhao; Gerard Wysocki; Weidong Chen; Eric Fertein; David Le Coq; Denis Petitprez; Weijun Zhang

doi:10.1364/OE.19.002493

Sensitive and selective detection of OH radicals using Faraday rotation spectroscopy at 2.8 μm

Weixiong Zhao, Gerard Wysocki, Weidong Chen, Eric Fertein, David Le Coq, Denis Petitprez, Weijun Zhang

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Abstract

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 g_J value make the Q (1.5) double lines of the ²π _3/2 state (ν = 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 × 10⁸ OH radicals/cm³.

Original language	English (US)
Pages (from-to)	2493-2501
Number of pages	9
Journal	Optics Express
Volume	19
Issue number	3
DOIs	https://doi.org/10.1364/OE.19.002493
State	Published - Jan 31 2011

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics

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abstract = "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 2π 3/2 state (ν = 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 × 108 OH radicals/cm3.",

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AU - Zhao, Weixiong

AU - Wysocki, Gerard

AU - Chen, Weidong

AU - Fertein, Eric

AU - Le Coq, David

AU - Petitprez, Denis

AU - Zhang, Weijun

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AB - 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 2π 3/2 state (ν = 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 × 108 OH radicals/cm3.

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Sensitive and selective detection of OH radicals using Faraday rotation spectroscopy at 2.8 μm

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