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DS: Fachverband Dünne Schichten

DS 26: Poster II

DS 26.44: Poster

Wednesday, March 25, 2009, 09:30–12:30, P5

XPS and UPS investigations of Cs₂Te photo cathodes — •Mike Sperling¹, Ruslan Ovsyannikov¹, Nadja Kath¹, Sara Canzio¹, Hermann Duerr¹, Antje Vollmer¹, Sven Lederer², Siegfried Schreiber², Frank Stephan², Paolo Michelato³, Laura Monaco³, Carlo Pagani³, and Daniele Sertore³ — ¹HZB-BESSY II, Berlin, Germany — ²DESY, Hamburg and Zeuthen, Germany — ³INFN Milano, LASA, Milano, Italy

Caesium Telluride (Cs₂Te) photo-cathodes are used as sources for electron beams because of their high Quantum Efficiency (QE) and their ability to release high peak current electron bunches in a high gradient RF-gun. A rapidly unexpected decrease of the initially QE, from 10