Experimental and theoretical studies of the electron temperature in nitrogen afterglow

Nikolay A. Dyatko, Yury Z. Ionikh, Nikolay B. Kolokolov, Alexander V. Meshchanov, Anatoly P. Napartovich

Research output

11 Citations (Scopus)

Abstract

In this paper, results of joint experimental and theoretical studies of the electron temperature in nitrogen afterglow at pulse-periodicai excitation are presented. Electron energy distribution function (EEDF) in an afterglow of a pulsed direct current discharge has been measured by means of a time-resolved Langmuir probe technique. Electron concentration, vibrational temperature, and population of lower metastable electronic state of N2 molecules have also been experimentally estimated at different delays after the discharge pulse. The results show that electron temperature in afterglow decreases with time, while the vibrational temperature remains almost constant. The EEDF has been calculated numerically from a steady-state Boltzmann equation, taking into account electron-electron collisions as well as superelastic collisions with vibrationally and electronically excited molecules. The vibrational distribution function was found numerically by solving a system of kinetic equations. Calculations show that the vibrational distribution function weakly varies within a cycle and is controlled by an average discharge power. Electron temperature in nitrogen afterglow for given populations of vibrational levels and of lower electronic level essentially depends on the electron concentration. Finally, a comparison of the theoretical and experimental results is performed.

Original languageEnglish
Pages (from-to)553-564
Number of pages12
JournalIEEE Transactions on Plasma Science
Volume31
Issue number4 II
DOIs
Publication statusPublished - Aug 2003

Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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