SMuK 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

P: Fachverband Plasmaphysik

P 5: Atmospheric Pressure Plasmas and their Applications I

P 5.3: Vortrag

Dienstag, 21. März 2023, 11:45–12:00, CHE/0089

State enhanced actinometry in a micro cavity plasma array — •David Steuer, Henrik van Impel, Volker Schulz-von der Gathen, Marc Böke, and Judith Golda — Ruhr-University Bochum, D-44801 Bochum, Germany

In recent years, plasma catalysis as an application of atmospheric pressure plasmas has become a research. Suitable reactors for investigating the fundamental interaction between plasmas and catalytic surfaces are micro cavity plasma arrays. To understand the plasma catalytic processes, it is important to monitor the densities of reactive species. In the case of atomic oxygen, this is typically done using laser spectroscopic methods. Due to the small dimensions of micro cavities between 50-200µm this is very complex. Therefore, a new approach, helium state enhanced actinometry (SEA)[1], was used. 2D resolved measurements are performed by using an ICCD camera in combination with a tuneable bandpass filter. The discharge is operated in helium with an oxygen admixture of 0.1%. An argon admixture of 0.05% is used as actinometer gas. The triangular excitation voltage between amplitudes of 400-800V is varied at a frequency of 15 kHz. Very high dissociation degrees up to nearly complete dissociation are observed. The spatial resolution allows density distributions within individual cavities to be resolved. Time resolved measurements show significant differences in oxygen density between the increasing potential phase and the decreasing potential phase. This work is supported by the DFG via SFB 1316 (project A6). [1]Steuer et al 2022 PSST 31 10LT01