Laboratory Studies of Oxygen Atom Recombination in Nitrogen at Mesospheric Temperatures

中层温度下氮中氧原子复合的实验室研究

• 批准号: 1441896
• 负责人: Konstantinos Kalogerakis
• 金额: $ 39.79万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1441896&HistoricalAwards=false
• 关键词: Laboratory; Studies; Oxygen; Atom; Recombination

This award supports laboratory experiments to study the kinetics of the process of oxygen atom recombination in a molecular nitrogen environment and the pathways that lead to excited states of molecular oxygen (O2) at temperatures relevant to the Earth's mesosphere. The project will supply basic physical measurements needed to interpret and model important processes in the upper atmosphere, such as O2 airglow and atmospheric dynamics. In addition to observational and theoretical studies of Aeronomy, this work could benefit research on planetary atmospheres. The project will contribute to the training and research experience of one or more postdoctoral fellows and undergraduate students. The role of collisional relaxation, the temperature-dependent recombination rate coefficient, the dominant energy flow pathways, and the resulting O2 excited state yields will be studied. These measurements are needed for a quantitative understanding and reliable modeling of the atmosphere and its airglow emissions. Knowledge of the details relevant to the production of excited O2 is critical input for the study and modeling of atmospheric composition, energy transfer, airglow, and transport dynamics. The experimental methodology involves the photoinitiation of O-atom recombination in a suitable bath gas by an ultraviolet radiation pulse from an excimer laser. Fluorescence and resonance-enhanced multiphoton ionization (REMPI) techniques are used to monitor the decay of the O-atom population and detect excited O2 molecules, thus providing insight into the relevant removal rate coefficients, energy flow pathways, and yields of the excited O2 states produced following recombination.

该奖项支持实验室实验，以研究分子氮环境中氧原子重组过程的动力学，以及在与地球中层相关的温度下导致分子氧（O2）激发态的途径。该项目将提供基本的物理测量，以解释和建模高层大气中的重要过程，例如O2气球和大气动态。除了对航空的观察和理论研究外，这项工作还可以使行星氛围的研究受益。该项目将有助于一个或多个博士后研究员和本科生的培训和研究经验。将研究碰撞弛豫，依赖温度的重组速率系数，主要能量流道和所得的O2激发态收率的作用。需要进行这些测量，以便对大气及其气流排放的定量理解和可靠的建模。了解与激发O2的生产有关的细节知识是研究和建模大气组成，能量转移，空气流和运输动力学的关键输入。实验方法涉及通过紫外线激光器的紫外线辐射脉冲在合适的浴气中进行O-ATOM重组的光构化。荧光和共振增强的多光子离子化（REMPI）技术用于监测O-ATOM群体的衰减并检测激发的O2分子，从而洞悉相关的去除速率系数，能量流道和激发的O2态产生后产生的激发的O2态的产量。