Abstract
A method is proposed for determining the electron density N e and the electric field E in the non-equilibrium nitrogen plasma of a low-pressure discharge from the spectra of the second positive system of N2. The method is based on measuring the specific energy deposition in the plasma and the distribution of nitrogen molecules over the vibrational levels of the C 3Π u state, as well as on modeling this distribution for a given energy deposition. The fitting parameters of the model are the values of N e and E. A kinetic model of the processes governing the steady-state density of the C 3Π u nitrogen molecules is developed. The testing of this method showed it to be quite reliable. The method is of particular interest for diagnosing electrodeless discharges and provides detailed information on the processes occurring in the discharge plasma. Preliminary data are obtained on the plasma parameters in a cavity microwave discharge and an electrode microwave discharge. In particular, it is found that the electric field in an electrode microwave discharge in nitrogen is lower than that in a hydrogen discharge. This effect is shown to be produced by stepwise and associative processes with the participation of excited particles in nitrogen.
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Original Russian Text © Yu.A. Lebedev, V.A. Shakhatov, 2006, published in Fizika Plazmy, 2006, Vol. 32, No. 1, pp. 58–74.
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Lebedev, Y.A., Shakhatov, V.A. Diagnostics of a nonequilibrium nitrogen plasma from the emission spectra of the second positive system of N2 . Plasma Phys. Rep. 32, 56–71 (2006). https://doi.org/10.1134/S1063780X06010065
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DOI: https://doi.org/10.1134/S1063780X06010065