The Effect of Light on the Electron Emission from Oxide-Coated Filaments

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Abstract
The increase in electron emission from oxide-coated platinum filaments when light is focused on them was studied as a function of applied potential, filament temperature, and wave-length of the incident light. The effect was zero at zero applied field but reached a saturation value at from 2 to 10 volts depending on the thickness of the oxide coating. At an applied potential sufficient to give saturation the effect increased with filament temperature up to about 1000° C and then became less for higher temperatures. The long wave-length limit of the effect was about 4000A. There is a sharp increase in sensitiveness for wave-lengths less than about 2500A.

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