Cesium Vapor Dispenser

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Abstract
A simple dispenser of cesium vapor was investigated to determine its utility as a stable and controllable source of cesium vapor for long life applications. The dispenser is basically a container filled with a mixture of cesium chromate and silicon powder. The powder reacts when it is heated to temperatures near 1000°K, and it releases a cesium vapor stream through a slit. The cesium vapor release rate was found to be stable and controllable by adjustments of the powder temperature. A constant and stable cesium flux could, therefore, be maintained over periods of many hours. At temperatures below 800°K the powder mixture is inert. This permits conventional bake‐out of the device and provides a convenient source of cesium vapor in demountable vacuum systems. These dispensers have been used successfully in experimental energy converters, cesiated cathode tubes, and in demountable vacuum systems.

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