Laboratory Studies of O(1D) Processes Important in the Upper Atmosphere

高层大气中重要的 O(1D) 过程的实验室研究

• 批准号: 0937317
• 负责人: Konstantinos Kalogerakis
• 金额: $ 32.61万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-04-01 至 2013-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0937317&HistoricalAwards=false
• 关键词: Laboratory; Studies; 1D; Processes; Important

The investigators will conduct a series of experiments on atmospherically important processes involving oxygen atoms in the singlet D state [O(1D)]. First, they will measure the rate coefficient for the collisional removal of O(1D) by oxygen atoms in the triple D state [O(3D)] and its temperature dependence in the range 300 to 1000 K. Recent laboratory studies at room temperature have indicated that relaxation by oxygen atoms is the most significant process controlling the intensity of the 630 nm red line emission at altitudes 200-300 km. The study will yield the first set of laboratory measurements at the relevant high temperatures. The investigators will also investigate the temperature dependence of other reaction rates important for understanding atmospheric oxygen emissions. These laboratory experiments are essential for improving the currently incomplete understanding of ionospheric red-line emission, allowing for better modeling and quantification of molecular oxygen Atmospheric Band emissions, and elucidating the role of oxygen atom energy transfer in the altitude range 120-400 km. Also, knowledge of the rate coefficient for the collisional removal of O(1D) by O(3P) allows the correct interpretation and analysis of the O(1D) emissions. These results will enhance the scientific return of ionospheric heating experiments by enabling a correct interpretation and quantification of the 630-nm red line emission. The rate coefficients to be measured are relevant to both calm and perturbed atmospheric conditions. This work should also help improve understanding of satellite drag and the interpretation of results from incoherent scatter radar measurements. Energy balance in the upper atmosphere is key to modeling the Earth as a system. Application of basic chemistry and physics to the study of collisional energy transfer processes on a fundamental level is also critical for understanding the operation of lasers, especially high-power chemical lasers. Finally, the study will contribute to training, mentoring, and research experiences of postdoctoral fellows and summer undergraduate students.

研究人员将进行一系列实验，研究涉及单重态D态氧原子[O（1D）]的大气重要过程。首先，他们将测量三重D态[O（3D）]中氧原子碰撞去除O（1D）的速率系数及其在300至1000 K范围内的温度依赖性。最近在室温下进行的实验室研究表明，氧原子的弛豫是控制200-300公里高度上630纳米红线发射强度的最重要过程。这项研究将在相关的高温下产生第一组实验室测量结果。研究人员还将研究对理解大气氧排放重要的其他反应速率的温度依赖性。这些实验室实验对于改进目前对电离层红线发射的不完全了解、更好地对分子氧大气带发射进行建模和量化以及阐明120-400公里高度范围内氧原子能量转移的作用至关重要。此外，知识的碰撞去除O（1D）的O（3 P）的速率系数允许正确的解释和分析的O（1D）的排放。这些结果将有助于正确解释和量化630纳米红线发射，从而提高电离层加热实验的科学回报。待测量的速率系数与平静和扰动大气条件都有关。这项工作还应有助于提高对卫星阻力的理解以及对非相干散射雷达测量结果的解释。高层大气中的能量平衡是将地球作为一个系统进行建模的关键。应用基础化学和物理学在基础水平上研究碰撞能量转移过程对于理解激光器，特别是高功率化学激光器的运行也至关重要。最后，这项研究将有助于博士后研究员和暑期本科生的培训，指导和研究经验。