Drift and reactions of positive tetratomic ions in dry, atmospheric air: Their effects on the dynamics of primary and secondary streamers
- LAPLACE, UMR CNRS 5213, Universite Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 9 (France)
The ion swarm data, namely, the reduced mobility, diffusion, and reaction rates of the positive tetratomic ions O{sub 4}{sup +} and N{sub 2}O{sub 2}{sup +} in N{sub 2} and O{sub 2} have been determined from a Monte Carlo simulation using calculated and fitted elastic and inelastic cross sections. The elastic momentum transfer cross sections have been determined from a semiclassical Jeffreys-Wentzell-Kramers-Brilouin (JWKB) approximation based on a rigid core potential model well adapted for polyatomic ions. The inelastic cross sections have been approximated from considerations based on the N{sub 4}{sup +}/O{sub 2} and N{sub 4}{sup +}/N{sub 2} systems. The validated cross section sets in pure N{sub 2} and O{sub 2} have been used to determine the O{sub 4}{sup +} and N{sub 2}O{sub 2}{sup +} swarm data in dry air over a large E/N range up to 1000 Td. However, due to the lack of experimental ion transport coefficients necessary for a more rigorous cross section validation, the present data, validated only at low E/N, should be regarded as a first approximation, susceptible to improvements as soon as measurements of ion transport coefficients become available in the literature. Then, the present data are used in a two-dimensional discharge dynamics fluid model for the simulation of the primary and secondary streamers for the case of a positive point-to-plane corona discharge in dry air. Relevant characteristics such as discharge current, charged particle densities, space charge electric field and the variation in active species like N and O radicals (very useful in many nonthermal plasma applications) are analyzed and discussed with and without the consideration of three positive tetratomic ions (N{sub 4}{sup +}, O{sub 4}{sup +}, and N{sub 2}O{sub 2}{sup +}). More particularly, the non-negligible effect of O{sub 4}{sup +}, in the dynamics of the primary and secondary streamers during the discharge propagation and relaxation stages is highlighted with an emphasis on the role of the related kinetic reactions occurring between the different charged particles.
- OSTI ID:
- 21476239
- Journal Information:
- Journal of Applied Physics, Vol. 107, Issue 10; Other Information: DOI: 10.1063/1.3410798; (c) 2010 American Institute of Physics; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
COMPUTERIZED SIMULATION
CORONA DISCHARGES
CROSS SECTIONS
DIFFUSION
ELECTRIC FIELDS
ION MOBILITY
MOLECULAR IONS
MOMENTUM TRANSFER
MONTE CARLO METHOD
NITROGEN IONS
OXYGEN IONS
PLASMA
PLASMA DRIFT
RADICALS
SEMICLASSICAL APPROXIMATION
SPACE CHARGE
WKB APPROXIMATION
APPROXIMATIONS
CALCULATION METHODS
CHARGED PARTICLES
ELECTRIC DISCHARGES
IONS
MOBILITY
PARTICLE MOBILITY
SIMULATION