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

本项目致力于开发一种基于红外、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。该项目是德国FZJ能源和气候研究所所长Andreas Wahner教授与科学家在实验室合作的成果。以前对这种方法的基础研究发现，它是高度敏感的，不受化学干扰，但由于与维持激光在现场的稳定性有关的限制，它的使用仅限于物理化学实验室。科学家们将探索将高选择性光谱方法与光纤激光技术的最新进展相结合，以开发一种新型的OH LIF仪器。羟基自由基是大气中最重要的氧化物种。它与空气中的许多化学物质发生反应，将它们氧化，并作为最终清除空气污染物和温室气体等重要痕量气体的净化机制。正在开发的新方法预计最终将在全球范围内应用于现场，从而能够对羟基自由基进行长期测量。由此产生的数据将对改善空气质量和气候变化的模型至关重要。

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.