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

该项目支持继续进行与大气中HOX循环有关的光化学反应的实验室研究。基于激光的诊断技术，如REMPI-TOF，将用于测量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，以确定臭氧光解产生的O(1D)的量子产率；(2)测量氧原子和羟基自由基(OH)在50-750托压力范围内与HO2反应的速率系数；(3)测量在相同压力范围内OH与NO2复合的速率系数，以及振动激发的OH与NO2的失活速率；以及(4)测量异戊二烯-OH加合物的生成热以及该加合物与O2、NO和NO2反应的速率系数。

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.