The transition between different modes of barrier discharges at atmospheric pressure
| Authors | |
|---|---|
| Year of publication | 2009 |
| Type | Article in Periodical |
| Magazine / Source | Journal of Physics D: Applied Physics |
| MU Faculty or unit | |
| Citation | |
| Web | 085208 |
| Field | Plasma physics |
| Keywords | barrier discharges; diffuse and filamentary mode; spectroscopy; electrical measurements; modelling |
| Description | Barrier discharges (BDs) can be operated in so-called diffuse modes. Depending on the operation conditions (gas composition, amplitude and frequency of applied voltage), different diffuse modes can be investigated, namely the Atmospheric Pressure Townsend Discharge (APTD) and the Atmospheric Pressure Glow Discharge (APGD). The subject of the paper is the study of transition between APTD and APGD as well as between diffuse and filamentary BD modes. Therefore BDs were studied in the gas mixtures N2/H2, N2/He, N2/Ne and N2/Ar. It is shown that APGD in noble gases helium and neon is formed due to high ionization rate at a comparatively low electric field, assisted by indirect ionization mechanisms involving metastable states of inert gases and nitrogen impurities, while the existence of APTD is coupled to the existence of metastable states of molecular nitrogen. |
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