Abstract
Results of experimental and theoretical study of plasma decay in the afterglow of high-voltage nanosecond discharges in gaseous ethylene and dimethyl ether at room temperature and pressures from 2 to 20 Torr are presented. Using a microwave interferometer, the time behavior of the electron density in the range from 2 × 1010 to 3 × 1012 cm–3 during plasma decay is investigated. By processing the experimental data, the effective coefficients of electron–ion recombination as functions of the gas pressure are obtained. It is found that these coefficients substantially exceed the recombination coefficients of simple hydrocarbon ions. This distinction, as well as the increase in the effective recombination coefficient with pressure, is explained by the formation of cluster ions in three-body collisions, which recombine with electrons more efficiently than simple molecular ions. The coefficients of three-body conversion of simple molecular ions into cluster ions in the plasmas of ethylene and dimethyl ether, as well as the coefficients of recombination of electrons with cluster ions in these gases, are determined by analyzing the experimental data.
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Original Russian Text © E.M. Anokhin, M.A. Popov, I.V. Kochetov, A.Yu. Starikovskii, N.L. Aleksandrov, 2017, published in Fizika Plazmy, 2017, Vol. 43, No. 12, pp. 1029–1039.
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Anokhin, E.M., Popov, M.A., Kochetov, I.V. et al. Plasma Decay in the Afterglow of High-Voltage Nanosecond Discharges in Unsaturated and Oxygenated Hydrocarbons. Plasma Phys. Rep. 43, 1198–1207 (2017). https://doi.org/10.1134/S1063780X17120017
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DOI: https://doi.org/10.1134/S1063780X17120017