Abstract
Measurements have been made of the impedance/frequency characteristics of a hot-cathode, dc, mercury-vapor plasma at a pressure of approximately 1 μ. The experimental tube contained a directly-heated cathode from a commercial mercury-vapor rectifier and provided a discharge column 80 cm long. Bridge techniques were used to obtain impedance loci extending to 2 Mc/sec for several values of anode current. These appeared to normalize, the magnitudes of the components being approximately inversely proportional to current. A basic equivalent circuit can be deduced, its parameters being dependent on physical processes occurring in the discharge. Prominent frequency components of the low-frequency voltage fluctuations present in the tube appear to be closely related to the impedance characteristics.
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