EAGER: Development of a Novel Double-resonance Fiber-laser-induced Fluorescence Instrument for Long-term, High-sensitivity, Interference-free Measurements of Hydroxyl Radical (OH)

本项目的重点是开发一种基于红外、紫外线、激光诱导荧光（IR-UV LIF）的测量大气中环境羟基自由基（OH）的新方法。该项目是与德国能源与气候研究所所长Andreas Wahner博士实验室的科学家合作完成的。先前对这种方法的基础研究发现，它是高度敏感的，没有化学干扰，但由于在现场保持激光稳定性的限制，它的使用仅限于物理化学实验室。科学家们将探索高选择性光谱方法与光纤激光技术最新进展的耦合，以开发一种新型OH LIF仪器。羟基自由基是大气中最重要的氧化物质。它与空气中的许多化学物质发生反应，氧化它们，并作为一种清洁机制，最终去除重要的微量气体，如空气污染物和温室气体。正在开发的新方法预计最终将在世界范围内适用于现场使用，从而能够长期测量羟基自由基。由此得出的数据将对改进空气质量和气候变化模型至关重要。

This project focuses on the development of a novel method for measuring ambient hydroxyl radicals (OH) in the atmosphere, based on the use of infra-red, ultra-violet, laser-induced fluorescence (IR-UV LIF). The project is a collaborate effort with scientists in the laboratory of Professor Dr. Andreas Wahner, Director of the Institute for Energy and Climate Research at Forschungszentrum Jülich (FZJ) in Germany. Previous fundamental studies on this method have found that it is highly sensitive and free from chemical interferences, but its use has been restricted to physical-chemistry laboratories due to limitations associated with maintaining the stability of the laser in the field. The scientists will explore the coupling of a highly selective spectroscopic method to the latest advances in fiber laser technology for the development of a novel OH LIF instrument.The hydroxyl radical is the most important oxidizing species in the atmosphere. It reacts with many chemical species in air, oxidizing them and serving as a cleansing mechanism for the ultimate removal of important trace gases such as air pollutants and greenhouse gases. The novel method being developed is expected eventually to be adapted worldwide for field use, enabling long-term measurements of the hydroxyl radical. The resulting data will be critical for improving models of air quality and climate change.