Open AccessIon composition of nitrogen plasma jet with carbon admixture
Author(s) -
D. I. Kavyrshin,
V. F. Chinnov,
O. V. Korshunov,
M. A. Sargsyan,
M. A. Khromov,
В. В. Щербаков
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1787/1/012063
Subject(s) - carbon fibers , ion , chemistry , plasma , ionic bonding , nitrogen , impurity , dissociative recombination , polyatomic ion , ionization , chemical physics , atomic physics , recombination , materials science , organic chemistry , biochemistry , physics , quantum mechanics , composite number , composite material , gene
With the aim of studying nitrogen plasma flow impacting graphite surfaces, we investigated the evolution of a plasma jet moving from the nozzle of the plasma torch to the target. The motion is accompanied by a decrease in temperature from 10 to 7 kK with a loss of ≈ 60% of the deposited energy and an increase in the density of carbon-containing impurities with partial preservation of the local thermodynamic equilibrium. The main reactions are thermal processes of the formation and decomposition of molecules, dissociative recombination and recharging of nitrogen ions. In the presence of carbon impurities, this set is supplemented with the substitution reaction C + N 2 ↔ CN + N, electron-collision processes of stepwise ionization and recombination, and a whole ion-molecular cascades of reloads and substitutions. It has been established that a small admixture of carbon (∼ 0.1%) manifests itself only in ion-molecular kinetics, increasing the electron concentration, determining the ionic composition of the plasma, and thereby violating the equilibrium between its neutral and charged components. This leads, in particular, to the recombination nonequilibrium distribution of carbon atoms over electronic states. Other carbon-containing impurities (CN and C 2 ) are not significant.