Collisional-radiative nonequilibrium in partially ionized atomic nitrogen

Kunc, Joseph A.; Soon, Willie

doi:10.1103/physreva.40.5822

Cited by 58 publications

(22 citation statements)

References 63 publications

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“…Although Kunc and Soon 14 and Soon and Kunc 36 considered various forbidden transitions, they note that their influence is small, especially the relatively large electron number densities present in the hypersonic shock-layers of interest in this study.…”

Section: C) Bound-bound Radiative Transitions (Atomic Line Transitions)mentioning

confidence: 99%

See 1 more Smart Citation

Non-Boltzmann Modeling for Air Shock-Layer Radiation at Lunar-Return Conditions

Johnston

Hollis

Sutton

2008

Journal of Spacecraft and Rockets

107

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This paper investigates the non-Boltzmann modeling of the radiating atomic and molecular electronic states present in lunar-return shock-layers. The Master Equation is derived for a general atom or molecule while accounting for a variety of excitation and de-excitation mechanisms. A new set of electronic-impact excitation rates is compiled for N, O, and N 2 + , which are the main radiating species for most lunar-return shock-layers. Based on these new rates, a novel approach of curve-fitting the non-Boltzmann populations of the radiating atomic and molecular states is developed. This new approach provides a simple and accurate method for

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Section: C) Bound-bound Radiative Transitions (Atomic Line Transitions)mentioning

confidence: 99%

“…The rate coefficients for electron-impact ionization from excited levels may be calculated accurately with the following formula proposed by Drawin For ionization from the lowest two states of oxygen and nitrogen, the rate coefficients proposed by Kunc and Soon 14 and Soon and Kunc 36 were used.…”

Section: B) Electron-impact Ionizationmentioning

confidence: 99%

Non-Boltzmann Modeling for Air Shock-Layer Radiation at Lunar-Return Conditions

Johnston

Hollis

Sutton

2008

Journal of Spacecraft and Rockets

107

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“…More sophisticated hypersonic chemical models of atomic N employ a collisional-radiative (CR) approach and treat the various electronic states of N as independent species [4][5][6][7][8][9][10][11][12]. However, this requires reliable EII data for a large number of states.…”

Section: Nomenclaturementioning

confidence: 99%

Electron-impact Ionization of Atomic Nitrogen

Ciccarino

Savin

2018

2018 AIAA Aerospace Sciences Meeting

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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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“…Soon after, however, it was recognized the importance of a time dependent integration of kinetic equations which are at the basis of the c-r models for situations characterized by very short macroscopic relaxation times. Time dependent solution of c-r models have been presented by Cacciatore et al [2][3][4][5] for atomic H, O and N plasmas many years ago and more recently these plasmas [6][7][8] have been again studied for explaining new experimental situations (e.g. laser-plasmas interaction) in which a time dependent solution of c-r models seems to be necessary.…”

Section: Introductionmentioning

confidence: 99%

On the coupling of collisional radiative models and Boltzmann equation for atomic transient hydrogen plasmas

Colonna¹,

Pietanza²,

Capitelli³

2001

AIP Conference Proceedings

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Abstract. Collisional-radiative model for atomic hydrogen has been coupled selfconsistently with the Boltzmann equation for electron kinetics to study the role of nonequilibrium electron distributions on the energy level kinetics. In particular, the role of second kind and electron-electron collisions in affecting both time dependent electron energy distributions and excited state population densities has been investigated.

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Collisional-radiative nonequilibrium in partially ionized atomic nitrogen

Cited by 58 publications

References 63 publications

Non-Boltzmann Modeling for Air Shock-Layer Radiation at Lunar-Return Conditions

Non-Boltzmann Modeling for Air Shock-Layer Radiation at Lunar-Return Conditions

Electron-impact Ionization of Atomic Nitrogen

On the coupling of collisional radiative models and Boltzmann equation for atomic transient hydrogen plasmas

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