par Devooght, Jacques 
;Dubus, Alain ;Dehaes, Jean-Claude
Référence Physical review. B, Condensed matter, 36, 10, page (5093-5109)
Publication Publié, 1987
;Dubus, Alain ;Dehaes, Jean-Claude Référence Physical review. B, Condensed matter, 36, 10, page (5093-5109)
Publication Publié, 1987
Article révisé par les pairs
| Résumé : | We have developed in this paper a semianalytical electron transport model designed for parametric studies of secondary-electron emission induced by low-energy electrons (keV range) and by fast light ions (100 keV range). The primary-particle transport is assumed to be known and to give rise to an internal electron source. The importance of the nearly isotropic elastic scattering in the secondary-electron energy range (50 eV) and the slowing-down process strongly reduce the influence of the anisotropy of the internal electron source, and the internal electron flux is nearly isotropic as is evidenced by the experimental results. The differential energy behavior of the inelastic scattering kernel is very complicated and the real kernel is replaced by a synthetic scattering kernel of which parameters are obtained by energy and angle moments conservation. Through a P1 approximation and the use of the synthetic scattering kernel, the Boltzmann equation is approximated by a diffusion slowing-down equation for the isotropic part of the internal electron flux. The energy-dependent partial reflection boundary condition reduces to a Neumann-Dirichlet boundary condition. An analytical expression for the Greens function of the diffusion slowing-down equation with the surface boundary condition is obtained by means of approximations close to the age-diffusion theory and the model allows for transient conditions. Independently from the improved age-diffusion model, a correction formula is developed in order to take into account the backscattering of primary electrons for an incident-electron problem. © 1987 The American Physical Society. |
