Photo-Ionization of Cæsium by Line Absorption (Classic Reprint) - Softcover

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Excerpt from Photo-Ionization of Cæsium by Line Absorption

There is a small surface effect which is greatest with the caesium at room temperature. Then light of all wave lengths from the ultra-violet to the visible gives an increase in electron current with a sensitivity highest in the ultra-violet, but entirely different from the photo-ionization sensitivity. This current change increases as the thermionic current is increased up to the saturation value by raising the cathode temperature, but unlike the space-charge effect there is no further increase upon exceeding the saturation temperature. These and other tests indicate that the effect can be ascribed to photo electric emission from a transparent caesium film on the quartz window.9 The photo-electric emission changes the potential of the film which in the arrangement of Figure 1 acts like an external grid on the electron emission. With higher vapor pressures the film resistance and potential change decrease. Well below 100° C. The effect is masked by the volume photo-ionization.

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