English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The effect of rough structures on the electron emission under electron impactbetween 10 eV and 2 keV is investigated with a new version of the low energyelectromagnetic model of GEANT4 (MicroElec). The inelastic scattering ismodeled, thanks to the dielectric function theory and the Mott's model ofpartial waves to describe the elastic scattering. Secondary electron emissionis modeled for grooved and checkerboard patterns of different dimensions foraluminum and silver. The analyses are performed according to two shapeparameters h/L and d/L, h being the height, L the width of the structures, andd the spacing between two neighboring structures. The secondary electronemission is demonstrated to decrease when h/L and d/L ratios increase. When theheight reaches 10 times the lateral dimensions, the electron emission yield isdivided by two compared to that of a flat sample. The optimization of the twoaspect ratios leads to a reduction of the electron emission yield of 80% forgrooved patterns and of 98% for checkerboard patterns. This purely geometriceffect is similar for aluminum and silver materials. A simple analytical model,capable of reproducing the effect on the electron emission yield ofcheckerboard and grooved patterns, is proposed. This model is found to be ingood agreement with the Monte Carlo simulations and some experimentalmeasurements performed in our irradiation facility.

Effect of rectangular grooves and checkerboard patterns on the electron emission yield