Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

A comparison between FEM and FIM images of the tungsten surface shows that stepped (high-index) planes influence emitted electrons in two ways; a) if monoatomic steps whose edges form the crystal face under question are wider than about three atoms, the surface behaves as a patchy surface formed by flat areas of the steps; b) if steps are narrower than the above mentioned limit, the emitted electrons feel the field of the crystal plane determined by step edges (the work function acquires low values corresponding to atomically rough surface).