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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.31: Poster
Thursday, March 19, 2026, 13:45–15:45, Redoutensaal
Secondary electron emission from coated plasma walls — •Franz Xaver Bronold and Felix Willert — Institut für Physik, Universität Greifswald, 17489 Greifswald, Germany
Having in mind dielectrically coated metal electrodes, used in barrier discharges, we investigate–from a theoretical solid-state physics point of view–the emission of secondary electrons from solid structures consisting of a thin dielectric layer on top of a metallic or semiconducting halfspace. We thus extend the invariant embedding principle for the electron backscattering function, which we used so far for halfspaces [1], to a stack of two materials. In addition to two backscattering functions, one for the coating and one for the supporting material, the electron transmission function for the coating has to be computed now as well. Focusing on low energies, and describing the solid structure by a randium-jellium model, containing electron-phonon, electron-ion-core, and electron-electron scattering (leading to impact ionization inside the two materials), we obtain, as a function of layer thickness, the electron surface scattering kernel for the total structure as well as the energy- and angle-resolved secondary electron emission yield. Besides showing results for SiO2/Si and SiO2/Au, we also discuss the numerics used for integrating the set of matrix Riccati/Sylvester differential equations for the backscattering and transmission functions of the coatings, which now appear along with the algebraic equation for the support’s backscattering function.[1] F. X. Bronold and F. Willert, Phys. Rev. E 110, 035207 (2024). Supported by Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)–495729137.
Keywords: Secondary electron emission; Surface scattering kernel; Semiclassical electron transport; Boltzmann equation