On the electrical discharge in D.C. and high frequency fields simultaneously

Summary

When a d.c. and a h.f. field are perpendicularly superposed in a electrical discharge (p∼10–10⁻⁴ mm Hg), three types of discharge can exist, classified from the standpoint of d.c. conduction: (1) d.c. glow type, d.c.-dominant discharge with additional ionization by h.f. field; (2) space chargelimited type, the same as the conduction in the floating double probe in a plasma produced by h.f field; (3) an intermediate stage between the first and second types, herein referred to as transition type. According to our analysis of the transition type at low pressure, the value of γ in high electric fields can be deduced from the measurement.