Monte Carlo simulations of electron dynamics in N2/CO2 mixtures |
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Authors: | M. Janda V. Martišovitš M. Morvová Z. Machala K. Hensel |
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Affiliation: | (1) école Centrale Paris, Laboratoire EM2C - CNRS UPR 288, Grande Voie des Vignes, 92290 Chatenay-Malabry, France;(2) Department of Astronomy, Comenius University, Faculty of Mathematics, Physics and Informatics, Earth Physics and Meteorology, Mlynská dolina F2, 842 48 Bratislava, Slovakia |
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Abstract: | Motivated by experimental investigations of electrical discharges in N2/CO2/H2O, Monte Carlo (MC) electron dynamics simulations in atmospheric N2/CO2 mixtures were performed. The goal was to obtain electron energy distribution functions (EEDFs), mean free path, drift velocity, collision frequency and mean energy of electrons, rate coefficients of electron-impact reactions, ionisation and attachment coefficients, as functions of the reduced electric field strength (E/N) and of the concentration of individual gas components. The results obtained by MC simulations were fitted with polynomials of up to the 3rd order with reasonable accuracy for E/N above 80 Td. The studied parameters below 80 Td were strongly non-linear as functions of E/N. This is mostly due to the influence of elastic collisions of electrons with CO2 molecules prevailing in CO2-dominant mixtures for E/N < 40 Td, and vibrational excitation collisions of N2 species prevailing in N2-dominant mixtures for E/N from 40 to 80 Td. The effect of these electron-impact processes was specific for each of the studied parameters. |
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Keywords: | 52.65.Pp Monte Carlo methods 02.50.Ng Distribution theory and Monte Carlo studies 51.50.+v Electrical properties (ionisation, breakdown, electron and ion mobility, etc.) |
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