Spatial Dependence of the Strong Optogalvanic Effects Due to Metastable Quenching in a DC Helium Discharge

  • Andrew C. Tam
  • Published 1982 in IEEE Transactions on Plasma Science


The optogalvanic effects of the He 2.058-¿m line (21P-21S) from He lamps illuminating a weak dc He discharge (current density ¿10 ¿A/cm2, field/pressure ~25 V/cm - torr) are reported. For illumination at the positive column, we have made quantitative measurements of the decreases in the discharge current, electron density, and metastable densities, as weli… (More)


9 Figures and Tables