RESEARCH STUDY FOR INCREASING THE SENSITIVITY OF FHOTOEMITTERS

摘要

A molecular beam antimony source was developed. The first attempts were made to form multi-alkali cathodes by quasi-simultaneous deposition of alkali metals on a rotating substrate, but definative results have not yet been obtained. Processing experiments on S-20 cathodes showed that a higher ratio of red to blue response can be obtained by using thicker cathode films. The response beyond 8000 A was found to vary greatly from tube to tube. So far, it has not been possible to identify the parameter which determines the long wavelength threshold. Chemical and X-ray analyses demonstrated that composition of the K-Cs-Sb cathode is K2CsSb and that it is a unique point in the cubic solid solution extending from Cs3Sb to K2.08Cs0.92Sb. The high energy electron diffraction apparatus was used successfully to follow the formation of a multi-alkali cathode by conventional processing from the initial deposit of antimony to the final composition of Na2KSb. (Author)