THE EFFECT OF SURFACE FILMS ON EXPLORING ELECTRODES IN GAS DISCHARGES

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Abstract
The presence of organic vapors in a hydrogen discharge is shown to influence greatly the current collected by an exploring electrode immersed in the discharge. It appears that the vapor molecules striking the collector may remain attached to its surface thus forming an insulating layer around it and limiting the current collected. The rate of formation of this layer is obtained from the rate of decrease of current to the collector. It is shown that this rate varies very greatly with the voltage of the collector and that the time required for the current to be reduced to one-half its initial value is shortest when the collector is at the space potential.

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