Heard Dwayne E
School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom.
Annu Rev Phys Chem. 2006;57:191-216. doi: 10.1146/annurev.physchem.57.032905.104516.
The hydroxyl radical, OH, is the most important cleansing agent in the Earth's atmosphere, removing the majority of trace gases by oxidation, including greenhouse gases and CFC replacements. It is intimately involved in the chemistry that generates photochemical smog, which includes many substances harmful to health, such as ozone and particulate matter. In this review, the technique of laser-induced fluorescence for the detection of OH in the atmosphere is described, using as an example the fluorescence assay by gas expansion (FAGE) instrument developed at the University of Leeds. The comparison of measured OH concentrations at a given field site with those calculated by an atmospheric model, which is a mathematical representation of the underlying chemistry, provides one of the best methods to test whether the key chemical and physical processes are understood. Examples are given for field measurements made in clean and polluted environments.
羟基自由基（OH）是地球大气中最重要的清洁剂，通过氧化作用去除大部分痕量气体，包括温室气体和氟氯化碳替代品。它与形成光化学烟雾的化学反应密切相关，光化学烟雾包含许多对健康有害的物质，如臭氧和颗粒物。在本综述中，描述了用于检测大气中OH的激光诱导荧光技术，并以利兹大学开发的气体膨胀荧光分析法（FAGE）仪器为例。将给定现场的实测OH浓度与通过大气模型计算得出的浓度进行比较，大气模型是基础化学的数学表示，这是检验关键化学和物理过程是否被理解的最佳方法之一。文中给出了在清洁和污染环境中进行现场测量的示例。
