Spectroscopic investigations of N2(A3 Σu+) metastables in the spatial ionisation growth in nitrogen

T. Makabe, H. Awai, T. Mori

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20 Citations (Scopus)


The authors describe a spectroscopic technique to investigate the transport processes of electrons and the quenching processes of excited metastable molecules under the condition of non-self-sustained Townsend discharges. The technique is applied to pure N2, and N2 including NO as an impurity at E/N=282.5 Td and currents less than 10-9 A. The quenching factor of N2(A3 Sigma u+) metastable by NO, defined by (1-(density of N2(A3 Sigma u+) in N2 with NO)/(density of N 2(A3 Sigma u+) in pure N 2)), is measured as a function of total gas density from the emission spectrum both of the second positive bands of N2 and of the gamma system of NO. The spatial profile of N2(A3 Sigma u+) is also monitored and estimated by the emission of the gamma system. It will be noted that half of the N2(A3 Sigma u+) metastables are deactivated with only 20 PPM of NO at N=1.94*1017 cm-3 in the low pressure ionisation growth chamber. The results give a quantitative explanation for the rapid decrease of the secondary ionisation coefficient in N2 in the presence of small amounts of the impurity. Also the radiative lifetime and the self-quenching rate coefficient are estimated in the present experimental conditions.

Original languageEnglish
Article number005
Pages (from-to)2367-2376
Number of pages10
JournalJournal of Physics D: Applied Physics
Issue number12
Publication statusPublished - 1984 Dec 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films


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