Laboratory Investigation of Vibration-Level Dependent Production of Oxygen via Energy Transfer from Nitrogen

通过氮气能量转移产生氧气的振动水平相关的实验室研究

• 批准号: 9910914
• 负责人: Marshall Ginter
• 金额: $ 27.37万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-05-15 至 2004-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9910914&HistoricalAwards=false
• 关键词: Laboratory; Investigation; Vibration; Level; Dependent

ATM-9910914Ginter, MarshallUsing reasonable assumptions based on laboratory data, atmospheric modelers calculate significantly more (factors of 3 to 4) O (1S ) than is observed in aurora and the dayglow [Bucsela et al. 1998]. Either there is a fundamental problem with the interpretation of previous experimental data or an important process (or processes) is (are) being neglected in current atmospheric models. The proposed research addresses this problem using new experimental techniques. The subsequent rates and pathways for loss of N2 (A) and production of O(1S) will be monitored directly using two-photon laser ionization to determine instantaneous changes in N2(A) and O(1S) concentrations and the branching ratios for O(1S) production. These measurements will be made for temperatures near 300 K, which are appropriate for comparison with existing laboratory measurements, and in the ~ 400- 600 K range appropriate to the lower thermosphere. Resulting data will be used (a) to determine reaction rate coefficients and O(1S) production efficiencies and branching ratios, (b) to identify the major mechanisms involving O(1S) production via N2(A) in the atmosphere, and (c) to provide critical input data for future airglow and auroral models.

ginter, marshall .使用基于实验室数据的合理假设，大气建模者计算出的O （1S）比在极光和日光中观测到的要多得多（因子为3 ~ 4）[Bucsela et al. 1998]。要么是先前实验数据的解释存在根本问题，要么是当前大气模式忽略了一个（或多个）重要过程。提出的研究使用新的实验技术来解决这个问题。利用双光子激光电离直接监测N2(A)损失和O（1S）生成的后续速率和途径，以确定N2(A)和O（1S）浓度的瞬时变化以及O（1S）生成的分支比。这些测量将在接近300 K的温度下进行，这适合与现有的实验室测量进行比较，并且在~ 400- 600 K范围内适合于较低的热层。结果数据将用于(a)确定反应速率系数和O（1S）产生效率和分支比率，(b)确定通过大气中N2(a)产生O（1S）的主要机制，以及(c)为未来的气辉和极光模型提供关键输入数据。