Photoemission from K–Te photocathodes

In this letter the photoemissive properties of K–Te films produced under ultrahigh vacuum conditions are reported. K–Te photocathodes were fabricated by vapor deposition of Te and K onto a Mo substrate into the preparation chamber of the Free Electron Laser of the University of Twente. The highest q...

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Bibliographic Details
Published in:Applied physics letters 1996-12, Vol.69 (24), p.3641-3643
Main Authors: Bisero, D., van Oerle, B. M., Ernst, G. J., Verschuur, J. W. J., Witteman, W. J.
Format: Article
Language:English
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Summary:In this letter the photoemissive properties of K–Te films produced under ultrahigh vacuum conditions are reported. K–Te photocathodes were fabricated by vapor deposition of Te and K onto a Mo substrate into the preparation chamber of the Free Electron Laser of the University of Twente. The highest quantum efficiency obtained at 259 nm was 11.1%, measured just after evaporation; this value decreased in a few minutes to a stable quantum efficiency of 8.3%. The reported results show that K–Te can be considered a promising material for the use as a photocathode in photoinjectors.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.117009