Near atomically smooth alkali antimonide photocathode thin films

TL;DR

This paper presents a reproducible method for producing alkali antimonide photocathode thin films with near-atomic smoothness, aiming to significantly reduce electron beam emittance and enhance beam coherence.

Contribution

The authors introduce a novel fabrication technique that achieves near-atomic smoothness in alkali antimonide photocathodes, surpassing previous surface roughness limitations.

Findings

Achieved near-atomic smoothness in alkali antimonide thin films.

Demonstrated potential for lower emittance electron beam generation.

Enhanced reproducibility of photocathode fabrication process.

Abstract

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