Near atomically smooth alkali antimonide photocathode thin films

• DOI: 10.1063/1.4974363
• Publication Date: 2017-01-24T16:13:53Z
• Authors: Jun Feng; Siddharth Karkare; James Nasiatka; Susanne Schubert; John Smedley; Howard Padmore
• Keywords: Antimonide; Photocathode

Nano-roughness limits the emittance of electron beams that can be generated by high efficiency photocathodes, such as thermally reacted alkali antimonide thin films. However there is an urgent need for photocathodes produce order magnitude or more lower than present day systems in to increase transverse coherence width beam. In this paper we demonstrate a method producing cathodes with near atomic smoothness reproducibility.