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Electron-impact Ionization of Atomic Nitrogen

机译:原子氮的电子碰撞电离

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We present new electron-impact ionization (EII) data for neutral atomic nitrogen. The atom is treated as a 67-state system, incorporating Rydberg values up to n = 20. State-specific cross sections for the first three states are from published B-spline R-matrix-with-pseudostates results. We have performed binary-encounter Bethe calculations for the remaining 64 states. These data are designed for modeling the hypersonic chemistry that occurs when a space vehicle enters Earth's atmosphere from beyond orbit. The cross sections have been convolved into state-specific thermal rate coefficients and fit with the commonly-used Arrhenius-Kooij formula for ease of use in shock-heated air plasma models. Additionally, we provide rate coefficients for a reduced 10-state system for use in coarse-grain models. Using detailed balance, these fine- and coarse-grain data can also be used to generate state-specific rate coefficients for three-body electron-ion recombination, the time reverse process of EII.
机译:我们提出了中性原子氮的新电子碰撞电离(EII)数据。该原子被视为67个状态的系统,其中包含高达n = 20的Rydberg值。前三个状态的特定于状态的横截面来自已发布的B样条R矩阵与伪状态的结果。我们已经对剩余的64个州执行了二进制遇到的Bethe计算。这些数据旨在模拟当航天器从轨道外进入地球大气时发生的高超音速化学反应。横截面已被卷积为特定于状态的热速率系数,并与常用的Arrhenius-Kooij公式拟合,从而易于在冲击加热的空气等离子体模型中使用。此外,我们提供了用于粗粒度模型的简化10态系统的速率系数。使用详细的平衡,这些细粒度和粗粒度数据也可以用于生成特定于状态的速率系数,以进行三体电子离子重组,这是EII的时间逆过程。

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