Differential Excitation Cross Section Measurements of O3 by Electron Impact: A Search for Ozone Excited Electronic States

通过电子撞击测量 O3 的差动激发截面：寻找臭氧激发电子态

• 批准号: 9020626
• 负责人: Tong-Wha Shyn
• 金额: $ 10万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-06-01 至 1993-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9020626&HistoricalAwards=false
• 关键词: Differential; Excitation; Cross; Section; Measurements

The PIs propose to conduct a detailed study of the electronic and vibrational structure of O3 by angle-resolved electron scattering spectroscopy. They assert that the electronic states must be better characterized in order to begin a proper assessment of the role of ozone in the chemistry, radiative transfer, and non-local thermodynamic equilibrium (non-LTE) effects in the terrestrial atmosphere. The PIs plan to reproduce the 15-yr-old electron energy loss spectra of Swanson and Celotta, with improved sensitivity, energy resolution, and angular coverage, and to extend the measurements to include determinations of electronic and vibrational excitation cross sections. The Swanson and Celotta result, though pioneering, is marginal in sensitivity and definitive feature assignments; however it remains the only tangible experimental evidence for the energetics of the controversial low-lying metastable states of ozone. The premise is that these states may participate in the O + O2 recombination sequence, and thus could be significant energy carriers in the photochemistry of O3 in the stratosphere, mesosphere, and thermosphere.

首席执行官建议就 电子和振动结构的O3的角分辨 电子散射光谱学 他们声称， 为了开始，必须更好地描述电子状态 适当评估臭氧在化学中的作用， 辐射传递和非局部热力学平衡 （非长期长期演进）对地球大气层的影响。 私家侦探计划 重现了15年前Swanson的电子能量损失谱 和Celotta，具有改进的灵敏度，能量分辨率， 角覆盖范围，并扩大测量范围， 电子和振动激发交叉的测定 路段 斯旺森和塞洛塔的研究结果虽然具有开创性， 灵敏度和确定性特征分配的边际; 然而，它仍然是唯一切实的实验证据， 有争议的低位亚稳态的能量学 臭氧。 前提是这些国家可以参与 O + O2重组序列，因此可能是重要的 平流层臭氧光化学中的能量载体， 中间层和热层