The Effect of Gas Heating on the Decay of Plasma with Hydrated Ions after a High-Voltage Nanosecond Discharge

Autor: Nikolay Aleksandrov, M A Popov, A. Yu. Starikovskii, Igor' V Kochetov, E. M. Anokhin
Rok vydání: 2021
Předmět:
Zdroj: Plasma Physics Reports. 47:742-751
ISSN: 1562-6938
1063-780X
DOI: 10.1134/s1063780x21070138
Popis: In this paper, plasma decay in the afterglow of a high-voltage nanosecond discharge in Н2О : О2 gas mixtures at temperatures from 300 to 600 K and pressures from 2 to 6 Torr is studied experimentally and theoretically. The time behavior of the electron density during plasma decay is measured in the range from 2 × 1012 to 1011 cm–3 using microwave interferometry. The effective coefficients of electron–ion recombination are obtained by processing the experimental data. These coefficients considerably exceed the recombination coefficients of simple ions; they increase with time and pressure during the plasma decay and decrease when gas is heated. Numerical simulations of the plasma decay kinetics in Н2О : О2 mixtures are performed in the zero-dimensional approximation taking into account the mixture heating and variations of the plasma ionic composition in the discharge afterglow. The calculations show that the relations obtained within the experiment are associated with the formation of hydrated ions in the discharge afterglow. The recombination with hydrated ions is more efficient than with simple molecular ions. The analysis of the calculation results suggests that the gas heating effect on plasma decay is determined primarily by the slowdown of complex hydrated ion production and, to a lesser extent, by the decrease in the coefficients of electron recombination with specific ions.
Databáze: OpenAIRE
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