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

研究人员将测量国家选择的双原子阳离子与中性氧原子之间反应的绝对总截面，这对行星大气中的离子化学建模非常重要。研究人员将使用一种独特的八极-四极光电离仪进行国家选择的离子-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。这种高分辨率使得双原子离子在离子-分子反应研究中的旋转态选择成为可能。我们将考察基态和亚稳态中氧原子的反应速率。这项实验的成功不仅将为模拟行星大气的离子化学提供相关的截面，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，离子自由基反应是发生在极端等离子体环境中的一类重要反应，包括行星大气。

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.