Előadó: Donkó Zoltán (Wigner FK SZFI)
Előadásának címe: How to compute the spectrally resolved light emission from low-temperature plasmas?
Dátum: 2025. április 8. kedd, 10 óra
Helyszín: 1-es épület tanácsterem
Összefoglaló:
Light emission is a very basic feature of plasmas, and its spectral composition conveys a lot of information about the various excitation channels and excited level populations of the gas atoms / molecules of the system. The latter, in turn, depend on the electron density and the energy distribution function of the electrons, and therefore, the prediction of the intensities of a set of spectral lines necessitates a precise calculation of these quantities via plasma simulation methods. Taking as an example a low-temperature low-ionization-degree argon plasma, excited by a radiofrequency voltage, it will be shown how the plasma properties and spectral line intensities can be calculated self-consistently. This is accomplished by coupling a particle-in-cell / Monte Carlo collision plasma simulation with a collisional radiative model that includes computation of the spatial density distribution of numerous argon excited levels, electron impact excitation and de-excitation collisions between these levels, radiative transitions between the excited levels as well as between the excited levels and the ground state, quenching reactions of the excited levels, and various (electron-impact and heavy-particle) ionization processes. Benchmarking of computed 'synthetic' spectra and excited atomic level populations with experimental data will be demonstrated.
