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ABSTRACT
Experimental investigations have been made on longitudinal oscillations of Plasma electrons in both cold-cathode and hot-cathode low pressure discharges in Argon gas.
In cold-cathode discharges no definite oscillations indicative of a fixed frequency could be picked up, instead a disturbance of constant deflection in the lecher-detector circuit was picked up and this perhaps could be attributed to some sort of noise phenomena.
In hot-cathode low pressure discharges in Argon with bright emitting W-filament, definite localized oscillations were picked up.
Frequency pulling effects were observed by the probe near the cathode as the probe distance from the cathode is varied for a fixed anode-cathode separation distance.
Similar frequency pulling effects were observed by the anode itself for small anode-cathode separation distances.