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A tube was constructed in which the neutralization of space charge by positive ions was studied. The positive ions were formed by the photo-electric ionization of caesium vapor. The change in current due to the illumination was measured as a function of such controllable variables as pressure, light intensity, anode voltage, and cathode emission. An empirical relation between change in anode current and illumination is given which may be fitted to the experimental results by adjusting one constant.

The neutralization of space charge by positive ions in caesium vapor