Electron-impact Ionization of Atomic Nitrogen

Ciccarino, Christopher J.; Savin, Daniel Wolf

New electron-impact ionization (EII) data are presented 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. Binary-encounter Bethe calculations have been performed 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, rate coefficients are provided for a reduced 10-state system for use in coarse-grain models. For a given collisional–radiative model, these fine- and coarse-grain data can be used to generate state-specific rate coefficients for three-body electron–ion recombination, the time-reverse process of EII.


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Also Published In

Journal of Thermophysics and Heat Transfer

More About This Work

Academic Units
Astronomy and Astrophysics
Published Here
March 15, 2023