Collisional-radiative coefficients from a three-level atomic model in nonequilibrium argon plasmas
A three-level atomic model is used for determining the steady-state collisional-radiative coefficients in nonequilibrium partially ionized argon plasmas. Rate equations for populations of the atomic levels are coupled to an electron Boltzmann equation that includes inelastic processes. The solution of these coupled equations yields an analytical form for the non-Maxwellian electron distribution function. The reabsorption of radiation in the plasma is included through the use of Holstein radiation escape factors (Phys. Rev. 83, 1159 (1951)). The cross sections in this model are included in the form of simple analytical expressions obtained from a numerical fitting of available experimental data. The results and limitations of the approach are discussed in a broad range of plasma conditions (electron temperature below 25 000 /sup 0/K and atomic density of 10/sup 14/--10/sup 18/ cm/sup -3/).
- Research Organization:
- Departments of Electrical and Aerospace Engineering and Physics, University of Southern California, Los Angeles, California 90089-0192
- OSTI ID:
- 6833415
- Journal Information:
- Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 30:2; ISSN PFLDA
- Country of Publication:
- United States
- Language:
- English
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ABSORPTION
ANALYTICAL SOLUTION
ARGON
ATOMIC MODELS
BOLTZMANN EQUATION
COLLISIONS
COUPLING
DIFFERENTIAL EQUATIONS
DISTRIBUTION FUNCTIONS
ELECTRON COLLISIONS
ELECTRON TEMPERATURE
ELEMENTS
ENERGY LEVELS
EQUATIONS
FLUIDS
FUNCTIONS
GASES
INELASTIC SCATTERING
IONIZED GASES
MATHEMATICAL MODELS
NON-EQUILIBRIUM PLASMA
NONMETALS
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA
RADIATION TRANSPORT
RADIATIONS
RARE GASES
SCATTERING
SELF-ABSORPTION
STEADY-STATE CONDITIONS
ULTRAHIGH TEMPERATURE
USES
WEAKLY IONIZED GASES