Basic Ionization, Airglow and Auroral Processes

基本电离、气辉和极光过程

• 批准号: 9988461
• 负责人: Alexander Dalgarno
• 金额: $ 48.42万
• 依托单位: Harvard University
• 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: 2000-06-15 至 2004-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9988461&HistoricalAwards=false
• 关键词: Basic; Ionization; Airglow; Auroral; Processes

ATM-9988461DalgarnoThe role of hot oxygen atoms on the chemistry, composition and the thermal structure of the atmosphere will be studied. Doppler profiles of emissions from electronically excited O(1D) atoms will be calculated. They are extensively used to determine thermospheric temperatures and neutral wind velocities. A major source of energetic oxygen atoms in ground (3P) and excited (1D) states is phototodissociation of O2 by solar ultraviolet radiation. Theoretical procedures will be applied to the quantitative determination of the cross sections, branching ratio and energy distributions of O (3P) and O (1D) atoms in the photodissociation of O2.Hot oxygen atoms are an important heating source of the neutral thermosphere. Their rate of thermalization strongly influences the heat and energy balance of the thermosphere. Semiclassical and quantum mechanical scattering calculations will be performed to evaluate the cross sections for collisions with both gases which thermalize the hot O atoms. By inserting the cross sections in the solutions of the Boltzmann equation, the non-equilibrium energy distribution functions of these atoms will be determined.

ATM-9988461 Dalgarno将研究热氧原子对大气化学、成分和热结构的作用。 计算了电子激发O（1D）原子辐射的多普勒分布。 它们被广泛用于确定热层温度和中性风速。 基态（3 P）和激发态（1D）的高能氧原子的主要来源是太阳紫外辐射引起的O2的光解。用理论方法定量地确定了O（3 P）和O（1D）原子在O2光解离过程中的反应截面、分支比和能量分布。热氧原子是中性热层的重要热源。 它们的热化速率强烈地影响着热层的热量和能量平衡。 半经典和量子力学散射计算将进行评估的两种气体热化的热O原子的碰撞的横截面。 通过在玻尔兹曼方程的解中插入截面，将确定这些原子的非平衡能量分布函数。