Rovibronic State-Selected Cross Sections for Reactions between Atmospheric Ions and Oxygen Atoms

大气离子与氧原子之间反应的 Rovibronic 状态选择横截面

• 批准号: 0317422
• 负责人: Cheuk-Yiu Ng
• 金额: $ 30.8万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-15 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0317422&HistoricalAwards=false
• 关键词: Rovibronic; State; Selected; Cross; Sections

The investigators will measure absolute total cross sections for reactions between state-selected diatomic cations and neutral oxygen atoms, which are of importance to modeling of the ion chemistry in planetary atmospheres. The investigators will use a unique octopole-quadropole photoionization apparatus for state-selected ion-molecule reaction studies. The unique feature of this apparatus is the implementation of the high-resolution pulsed field ionization-photoelectron-photoion coincidence technique for state-selection of reactant ions. The high resolution achieved has made possible the rotational state selection of diatomic ions for ion-molecule reaction studies. Reaction rates involving oxygen atoms in the ground state and the metastable state will be examined. The success of this experiment will not only provide relevant cross sections for modeling the ion chemistry of planetary atmospheres, but will also open up a new research area concerning the fundamental study of ion-radical reactions, which represent an important class of reactions occurring in extreme plasma environments, including planetary atmospheres.

研究人员将测量状态选择的双原子阳离子和中性氧原子之间反应的绝对总截面，这对行星大气中离子化学的建模非常重要。 研究人员将使用一种独特的八极四极光电离装置进行状态选择离子分子反应研究。 该装置的独特之处在于实现了高分辨率的脉冲场电离-光电子-光离子符合技术，用于反应物离子的状态选择。 高分辨率的实现使双原子离子的旋转状态选择的离子-分子反应的研究成为可能。 涉及氧原子在基态和亚稳态的反应速率将被检查。 这项实验的成功不仅将为行星大气的离子化学建模提供相关的横截面，而且还将开辟一个新的研究领域，涉及离子自由基反应的基础研究，这代表了极端等离子体环境中发生的一类重要反应，包括行星大气。