Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 10: Poster Session I
P 10.17: Poster
Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Electrons interacting with dielectric slabs — •Franz Xaver Bronold and Felix Willert — Institut für Physik, Universität Greifswald, 17489 Greifswald, Germany
As a preparatory step for computing secondary electron emission probabilities for dielectrically coated electrodes used in dielectric barrier discharges, we investigate–from a microscopic solid-state physics point of view–the interaction of electrons with dielectric slabs of finite thickness. Whereas for a halfspace geometry, only electron backscattering (including secondary emission) has to be considered, it is now also required to quantify electron transmission through the slab. Leaving aside the interaction of the transmitted electrons with the metal supporting the dielectric layer,we describe in this contribution how the slab’s energy and angle-resolved transmission and backscattering functions can be obtained from the invariant embedding principle used by us so far for modeling secondary emission from halfspaces [1]. Both functions enter the equation determining electron backscattering from the dielectric-metal heterostructure comprising the barrier discharge’s electrode. Representative data for SiO2, described by a semiempirical randium-jellium model, are shown as a function of layer thickness, in addition to the Möbius scheme used for numerically integrating the set of matrix Riccati/Sylvester differential equations, arising in slab geometry, in contrast to their algebraic counterparts appearing in the modeling of halfspaces. [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