Method for expeditiously processing a sodium-potassium-cesium-an

Details Method for expeditiously processing a sodium-potassium-cesium-an Method for expeditiously processing a sodium-potassium-cesium-an

1980-06-30

1981-12-15

Hoffman, James R.

Coating processes

Measuring, testing, or indicating

Thickness or uniformity of thickness determined

427 74, H01J 134, B05D 136

Patent

active

043059724

ABSTRACT:
A method is provided for making a photocathode including the step of forming a base layer including antimony on a substrate. Sodium is then evaporated at an elevated temperature onto the base layer such that the sensitivity increases to a value which is less than a peak value. At an intermediate temperature potassium is evaporated to a first peak value of sensitivity. Antimony and potassium are alternately evaporated until a second peak value of sensitivity is achieved. At the above-mentioned intermediate temperature, cesium is evaporated to a third peak value of sensitivity. Antimony and cesium are alternately evaporated until a fourth peak value of sensitivity is attained. The photocathode is slow cooled from the intermediate temperature to a second intermediate temperature at which point the cooling rate is increased in order to permit the photocathode to reach room temperature.

REFERENCES:
patent: 2676282 (1954-04-01), Polkosky
patent: 2770561 (1956-11-01), Sommer
patent: 3023131 (1962-02-01), Cassman
patent: 3372967 (1968-03-01), Hughes
patent: 3434876 (1969-03-01), Stoudenheimer et al.
patent: 3498834 (1970-03-01), Rome et al.
patent: 3658400 (1972-04-01), Helvy
Sommer, Photoemissive Materials, John Wiley & Sons, Inc., New York, 1968, pp. 114-124.

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