Near atomically smooth alkali antimonide photocathode thin films

Jun Feng, Siddharth Karkare, James Nasiatka, Susanne Schubert, John Smedley, Howard Padmore

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Nano-roughness is one of the major factors degrading the emittance of electron beams that can be generated by high efficiency photocathodes, such as the thermally reacted alkali antimonide thin films. In this paper, we demonstrate a co-deposition based method for producing alkali antimonide cathodes that produce near atomic smoothness with high reproducibility. We calculate the effect of the surface roughness on the emittance and show that such smooth cathode surfaces are essential for operation of alkali antimonide cathodes in high field, low emittance radio frequency electron guns and to obtain ultracold electrons for ultrafast electron diffraction applications.

Original languageEnglish (US)
Article number044904
JournalJournal of Applied Physics
Volume121
Issue number4
DOIs
StatePublished - Jan 28 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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