The Conductivity of a High Frequency Discharge in Hydrogen

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Abstract
Measurements were made of the voltage between electrodes necessary to produce a current of 100 milliamperes in the discharge for gas pressures between 0.005 mm and 1.0 mm and for frequencies of oscillation between 1.25 and 20 million cycles per second (wave-lengths between 240 and 15 meters). It was found that the discharge has its maximum conductivity when operated at a frequency of 15 million cycles (20 meters) and a pressure of 0.015 mm. A theory of the mechanism of the high frequency discharge indicates that under these conditions, an electron makes an inelastic collision with a gas molecule every electronic mean free path having been under the influence of the electric force for one half cycle. The theory also indicates that for any frequency of oscillation greater than 15 million cycles, both the electric force and the gas pressure for which the conductivity is a maximum, will increase directly with the frequency of oscillation.

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