Effect of Primary-Electron Diffusion on Secondary-Electron Emission

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Abstract
We consider some effects of primary-electron diffusion on secondary-electron emission from a free-electron model of a polycrystalline target-in particular the angular distribution and energy dependence of the secondaries. The distributions of primary electrons due to incident 2- and 10-keV monoenergetic beams are obtained by means of a Boltzmann equation. The fraction of back-scattered primaries is found to be in good agreement with experiment. The primary distributions excite distributions of secondary electrons which diffuse toward and are transmitted through the surface. In accord with experiment the large angular ansiotropy in the emitted secondary-electron distribution predicted by Stoltz is found to be greatly reduced by the primary diffusion. The transmission coefficient, not included in previous calculations, is also of importance in determining the characteristics of the observed secondaries.