Production Pathways and Yields of Excited O2 Important for Mesospheric Nightglow

激发态 O2 的产生途径和产量对中层夜光很重要

• 批准号: 2009960
• 负责人: Konstantinos Kalogerakis
• 金额: $ 56.64万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2009960&HistoricalAwards=false
• 关键词: Production; Pathways; Yields; Excited; O2

This award would support the laboratory studies of the reactions that lead to molecular oxygen electronically excited states that are observed in the Earth's mesospheric and lower thermosphere (MLT) nightglow (70 to 110 km). The award would investigate the role of collisional relaxation within the dominant energy flow pathways and would measure the O2 excited-state yields resulting from the process of termolecular association of oxygen atoms. These measurements would provide a quantitative understanding necessary to support the reliable modeling of the atmosphere MLT airglow emissions removing the significant gaps and reducing uncertainties that currently exist in the understanding of these processes. Laser-based laboratory methodologies would be used to investigate MLT nightglow emissions that have recently led to major breakthroughs in the understanding of these nightglow phenomena. Finally, the proposed research will contribute to the development of research experiences for undergraduate students while also providing training for one or more postdoctoral fellows.These laboratory studies will provide insight at the atomic and molecular level into the underlying production mechanisms, energy flow pathways, and yields of the excited O2 states produced following termolecular O-atom association. These investigations will also supply basic physical measurements currently needed to interpret and model important O-atom processes that generate electronically excited O2 in the Earth’s mesosphere. These measurements will quantify the O2 airglow mechanisms allowing the subsequent probe of atmospheric composition and dynamics by remote sensing. Application of basic chemistry and physics to the study of collisional and molecular energy transfer processes on a fundamental level is also critical for understanding combustion, astrophysical environments, as well as the operation of lasers, especially high-power chemical lasers.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该奖项将支持对在地球中间层和低热层夜光（70至110公里）中观测到的导致分子氧电子激发态的反应进行实验室研究。该奖项将调查碰撞弛豫的作用内的主导能量流的途径，并将测量O2激发态产量所产生的过程中的三分子缔合氧原子。这些测量将提供必要的定量理解，以支持大气MLT气辉排放的可靠建模，消除重大差距，减少目前存在的不确定性，在这些过程的理解。基于激光的实验室方法将被用来调查MLT夜光排放，最近导致这些夜光现象的理解取得重大突破。最后，拟议的研究将有助于本科生的研究经验的发展，同时也为一个或多个博士后fellows.These实验室研究提供深入了解在原子和分子水平的潜在的生产机制，能量流动的途径，和产率的激发态O2产生以下termolecular O原子协会。这些调查还将提供基本的物理测量，目前需要解释和模拟重要的O-原子过程，产生电子激发的O2在地球的中间层。这些测量将量化的O2气辉机制，使随后的探测大气成分和动态遥感。应用基础化学和物理学研究碰撞和分子能量转移过程，对于理解燃烧、天体物理环境以及激光器（尤其是高功率化学激光器）的运行也至关重要。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。