Heterogeneous Chemistry of HOx Radicals in the Troposphere

HOx自由基与对流层气溶胶表面的相互作用被认为是显着的，但很少有关于这种过程的机制和速率的信息。 本项目是对OH和HO2自由基与对流层气溶胶相互作用的实验室研究。 将使用低压流管技术，结合化学电离质谱法检测反应物和产物。 各种有机和无机表面将被检查，以模拟发生在自然和气候影响的气溶胶，包括海盐和硫酸盐的反应。 自由基反应对这些表面吸水的影响也将使用椭圆偏振法，一种非破坏性的光学技术进行检查。

The interaction of HOx radicals with tropospheric aerosol surfaces is believed to be significant, but there is little information regarding the mechanisms and rate of such processes. This project is a laboratory investigation of the interaction of OH and HO2 radicals with tropospheric aerosols. A low-pressure flow tube technique will be used, coupled with chemical ionization mass spectrometry for detection of reactants and products. Various organic and inorganic surfaces will be examined, to simulate reactions occurring on natural and anthropogenically influenced aerosols, including seasalt and sulfates. The influence of radical reactions on water uptake by these surfaces will also be examined using ellipsometry, a non-destructive optical technique.