Articles | Volume 18, issue 5
https://doi.org/10.5194/amt-18-1243-2025
https://doi.org/10.5194/amt-18-1243-2025
Research article
 | 
11 Mar 2025
Research article |  | 11 Mar 2025

Development of a portable laser-flash photolysis Faraday rotation spectrometer for measuring atmospheric total OH reactivity

Bo Fang, Nana Wei, Weixiong Zhao, Nana Yang, Hao Zhou, Heng Zhang, Jiarong Li, Weijun Zhang, Yanyu Lu, Zhu Zhu, and Yue Liu

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Short summary
A portable laser-flash photolysis Faraday rotation spectrometer for measuring atmospheric total hydroxyl (OH) reactivity was developed, with optical box dimensions of 130 cm × 40 cm × 35 cm. It features a pump–probe multi-pass cell with a high overlapping factor of 75.4 %. The instrument’s precision and uncertainty are 1.0 s-1 (1σ, 300 s) and within 2 s-1, respectively. This portable, cost-effective instrument expands current measurement capabilities and is convenient for field applications.
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