Laboratory Studies of the Kinetics and Photochemistry of HOx Cycling in the Lower Atmosphere

该项目支持继续对与大气中HOx循环有关的光化学反应进行实验室研究。将使用激光诊断技术，如快速多光子电离层飞行时间，测量在与大气相关的温度和压力条件下的光解产率和反应速率。具体任务包括：（1）光化学研究以确定来自臭氧光解的O（1D）的量子产率，（2）在50-750 Torr的压力范围内测量氧原子和羟基自由基（OH）与HO 2反应的速率系数，（3）在相同压力范围内测量OH与NO 2复合的速率系数，以及振动激发的OH与NO2的失活速率;和（4）异戊二烯-OH加合物的生成热和加合物与O2、NO和NO2的反应速率系数的测量。

This project supports continued laboratory studies of photochemical reactions related to the cycling of HOx in the atmosphere. Laser-based diagnostics techniques, such as REMPI-TOF will be used to measure photolysis yields and reaction rates at temperature and pressure conditions relevant to the atmosphere. Specific tasks include: (1) photochemical studies to determine the quantum yield of O(1D) from the photolysis of ozone, (2) measurements of the rate coefficients for the reactions of oxygen atoms and hydroxyl radical (OH) with HO2 over the over the pressure range 50-750 Torr, (3) measurements of the rate coefficient for the recombination of OH with NO2 over the same pressure range, together with the rates of deactivation of vibrationally excited OH with NO2; and (4) measurements of the heat of formation of the isoprene-OH adduct and the rate coefficients for the reactions of the adduct with O2, NO, and NO2.