NEW OXYGEN-SILVER-CESIUM PHOTOCATHODES,
ARMY ENGINEER RESEARCH AND DEVELOPMENT LABS FORT BELVOIR VA
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The Ag-O-Cs-Ag photocathodes described in this article differ from ordinary Ag-O-Cs cathodes in spectral response, in the noticeable shift of the infrared peak toward the ultraviolet, in higher sensitivity in the 6000-4000 A region, and in very slight fatiguing with high integral sensitivity. The combination of high sensitivity and absence of fatigue makes it possible to substitue the new phototubes for oxygen-silver-cesium gas tubes even where they cannot be replaced by antimonycesium phototubes owing to the nature of the spectral response of the latter types absence of sensitivity in the infrared portion of the spectrum. Thus, if further tests confirm available data indicating slight fatiguing of these cathodes, it may be assumed that in addition to nonfatiguing cathodes for the visible region antimony-cesium, there also can be stable cathodes for the near infrared region.