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Title: Ionic composition of a humid air plasma under ionizing radiation

Abstract

A kinetic model is proposed for ion–molecular processes involving charged particles of a humid air plasma produced by a fast electron beam. The model includes more than 600 processes involving electrons and 41 positive and 14 negative ions, including hydrated ions H{sub 3}O{sup +} (H{sub 2}O){sub n} and O{sub 2}{sup −}(H{sub 2}O){sub n} with n = 1, 2, …, 12. The energy costs of production of electron–ion pairs and electronic and vibrational (for water molecules, also rotational) excitation of molecules are calculated in nitrogen, oxygen, water vapor, air, and humid air. A method is proposed for calculating the energy costs in mixtures by the calculation data in pure gases. The evolution of the plasma composition is studied by the numerical solution of a system of 56 time-dependent balance equations for the number of charged particles of plasma by the fourth-order Runge–Kutta method. The steady-state composition of plasma is determined by solving nonlinear steady-state balance equations for the ionization rates of humid air from 10 to 10{sup 16} cm{sup –3}/s and the fraction of water molecules from 10{sup –3}% to 1.5%. It is established that, for water vapor content (the ratio of the number density of water molecules to the totalmore » number density of air molecules) of 0.015–1.5% in air at atmospheric pressure and room temperature, the main ion species are two types of positive ions H{sub 3}O{sup +} (H{sub 2}O){sub n} with the number of water molecules n = 5, 6 and three species of negative ions O{sub 2}{sup −}(H{sub 2}O){sub n} with n = 5, 8, 9.« less

Authors:
; ; ; ; ; ;  [1]
  1. State Research Center of the Russian Federation, Troitsk Institute for Innovation and Fusion Research (Russian Federation)
Publication Date:
OSTI Identifier:
22756367
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 125; Journal Issue: 2; Other Information: Copyright (c) 2017 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATMOSPHERIC PRESSURE; ELECTRON BEAMS; ENERGY ACCOUNTING; ION PAIRS; IONIC COMPOSITION; IONIZING RADIATIONS; MATHEMATICAL EVOLUTION; MATRICES; MOLECULES; NONLINEAR PROBLEMS; OXONIUM IONS; PLASMA; RUNGE-KUTTA METHOD; TEMPERATURE RANGE 0273-0400 K; TIME DEPENDENCE; WATER VAPOR

Citation Formats

Filippov, A. V., E-mail: fav@triniti.ru, Derbenev, I. N., Dyatko, N. A., Kurkin, S. A., Lopantseva, G. B., Pal’, A. F., and Starostin, A. N. Ionic composition of a humid air plasma under ionizing radiation. United States: N. p., 2017. Web. doi:10.1134/S1063776117070020.
Filippov, A. V., E-mail: fav@triniti.ru, Derbenev, I. N., Dyatko, N. A., Kurkin, S. A., Lopantseva, G. B., Pal’, A. F., & Starostin, A. N. Ionic composition of a humid air plasma under ionizing radiation. United States. doi:10.1134/S1063776117070020.
Filippov, A. V., E-mail: fav@triniti.ru, Derbenev, I. N., Dyatko, N. A., Kurkin, S. A., Lopantseva, G. B., Pal’, A. F., and Starostin, A. N. Tue . "Ionic composition of a humid air plasma under ionizing radiation". United States. doi:10.1134/S1063776117070020.
@article{osti_22756367,
title = {Ionic composition of a humid air plasma under ionizing radiation},
author = {Filippov, A. V., E-mail: fav@triniti.ru and Derbenev, I. N. and Dyatko, N. A. and Kurkin, S. A. and Lopantseva, G. B. and Pal’, A. F. and Starostin, A. N.},
abstractNote = {A kinetic model is proposed for ion–molecular processes involving charged particles of a humid air plasma produced by a fast electron beam. The model includes more than 600 processes involving electrons and 41 positive and 14 negative ions, including hydrated ions H{sub 3}O{sup +} (H{sub 2}O){sub n} and O{sub 2}{sup −}(H{sub 2}O){sub n} with n = 1, 2, …, 12. The energy costs of production of electron–ion pairs and electronic and vibrational (for water molecules, also rotational) excitation of molecules are calculated in nitrogen, oxygen, water vapor, air, and humid air. A method is proposed for calculating the energy costs in mixtures by the calculation data in pure gases. The evolution of the plasma composition is studied by the numerical solution of a system of 56 time-dependent balance equations for the number of charged particles of plasma by the fourth-order Runge–Kutta method. The steady-state composition of plasma is determined by solving nonlinear steady-state balance equations for the ionization rates of humid air from 10 to 10{sup 16} cm{sup –3}/s and the fraction of water molecules from 10{sup –3}% to 1.5%. It is established that, for water vapor content (the ratio of the number density of water molecules to the total number density of air molecules) of 0.015–1.5% in air at atmospheric pressure and room temperature, the main ion species are two types of positive ions H{sub 3}O{sup +} (H{sub 2}O){sub n} with the number of water molecules n = 5, 6 and three species of negative ions O{sub 2}{sup −}(H{sub 2}O){sub n} with n = 5, 8, 9.},
doi = {10.1134/S1063776117070020},
journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 2,
volume = 125,
place = {United States},
year = {2017},
month = {8}
}