Voltage-current density (V-j) characteristics were studied in the cathode region of noble gas mixture glow discharges. Measurements were carr out in He-X (X = Ne, Ar, Kr, Xe) mixtures in plane cathode and hollow cathode arrangements. The partial pressure of the admixed gas was maximum 2% of th total pressure. It was found that at constant voltage the current density increasi by mixing Ar to He, while it decreased when Ne, Kr or Xe were added. Above t certain partial pressure value the current density was found to increase again ir the case of Ne and Kr admixtures. In He-Xe it decreased, however, in the who range investigated. These observations are explained, taking into account ionization processes and the differences in secondary electron emission coefficients.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Acoustics and Ultrasonics
- Surfaces, Coatings and Films