Spectral Extension of Potassium Photocathode Sensitivity

摘要

Photoelectric measurements on potassium deposited in argon at pressures of 1 to 24 Torr have shown photoemission which is spectrally extended into the red when compared to vacuum‐deposited potassium. In addition, these cathodes have exhibited a larger magnitude of increase of output current with increase of anode voltage than that obtained with vacuum‐deposited cathodes. A mechanism based upon the cathode structure formed by gas ambient deposition is presented to explain these effects.