Photochemical and Collisional Effects in Trace Atmospheric Species Monitoring

本项目在实验室进行OH自由基的实验 与监测特定痕量的三大需求有关 将在大气中的物种。 研究 A-X电子中激光诱导荧光的偏振 OH体系，以及态-态转动能模型 在A-状态下的转移，涉及检测OH本身， 对流层 弱振动带的跃迁几率 A-X系统对OH检测的影响以及对OH的研究 大气动力学 高能粒子的碰撞猝灭 在A-状态的旋转水平，和温度依赖性的 这一过程决定了量子产率的测量， 用莱曼-A湿度计测量平流层的水 HNO 3是一种分子 在相对较低的水平上难以检测， 干净的对流层 SRI的科学家们研究了新生的分布 OH的振动和旋转水平，以下 HNO 3的光解离，以及这种分布的弛豫 变成了热的 这些数据对于设计一个 硝酸的光致碎裂/激光诱导荧光法 监测.

In this project laboratory experiments on the OH radical pertinent to three major needs for monitoring particular trace species in the atmosphere will be carried out. The study of polarization of laser-induced fluorescence in the A-X electronic system of OH, and the modeling of state-to-state rotational energy transfer in the A-state, concern detection of OH itself in the troposphere. Transition probabilities for weak vibrational bands of the A-X system impact OH detection as well as studies of OH kinetics for atmospheric purposes. Collisional quenching of high rotational levels in the A-State, and the temperature dependence of this process, govern quantum yields in the measurement of stratospheric H2O with a Lyman-a hygrometer. HNO3 is a molecule difficult to detect at the low levels present in the relatively clean troposphere. SRI scientists study the nascent distribution of OH over vibrational and rotational levels, following the photodissociation of HNO3, and the relaxation of this distribution to a thermal one. These data are necessary for the design of a photoframentation/laser-induced fluorescence method for nitric acid monitoring.