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

Research output: Contribution to journalArticle

32 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)2493-2501
Number of pages9
JournalOptics Express
Volume19
Issue number3
DOIs
StatePublished - Jan 31 2011

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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