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Proceedings Paper

Rotational temperatures in silent discharges in He/N2 mixtures
Author(s): Nikita K. Bibinov; A. A. Fateev; K. Wiesemann
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Paper Abstract

In high pressure (p?0.2 bar) silent discharges in He/N2 mixtures we measured by high-resolution optical emission spectroscopy rotational temperatures of the first negative and the second positive systems of nitrogen. Both temperatures differ appreciably. This can be attributed to different types of reactions by species having high potential energy (ions, metastables): fast reactions (Penning ionization and charge exchange by He metastables and ions) occur inside the micro discharge channels or in its immediate neighborhood. Slow reactions (excitation transfer from metastable nitrogen molecules) take place at a much later stage in the cold ambient gas. The high temperature thus indicates the temperature of the microdischarges. This temperature is influenced by the gas dynamic expansion of the plasma channels created by the microdischarges. Experimental results we have fitted to gas dynamic model calculations. From these fits we could deduce parameters like the channel radii. Further we studied the radiation emitted from NO and OH. These species have low rotational temperatures indicating excitation in slow processes and the temperature ofthe ambient gas.

Paper Details

Date Published: 19 March 2002
PDF: 12 pages
Proc. SPIE 4460, Selected Research Papers on Spectroscopy of Nonequilibrium Plasma at Elevated Pressures, (19 March 2002); doi: 10.1117/12.459403
Show Author Affiliations
Nikita K. Bibinov, Ruhr-Univ. Bochum (Germany)
A. A. Fateev, Ruhr-Univ. Bochum (Germany)
K. Wiesemann, Ruhr-Univ. Bochum (Germany)

Published in SPIE Proceedings Vol. 4460:
Selected Research Papers on Spectroscopy of Nonequilibrium Plasma at Elevated Pressures
Vladimir N. Ochkin, Editor(s)

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