Abstract
A method for the measurement of saturated thermionic emission in pure alkali halide vapor was developed, and made possible the study of electrical sorption properties at much higher pressures than previously available. Ion emission in this pressure range was found not to follow the temperature dependence of the Saha-Langmuir equation, but can be treated by a modified equation which takes into account the heat of dissociation on the surface. The persistence of iodine sorption as the substrate temperature is raised increases with pressure of ambient iodide vapor; cesium, from cesium iodide, persists to equally high temperatures. NaI raises the work function of hot tungsten over the entire range studied, while CsI is even more effective in lowering the work function.
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