Augsburg 2006 – scientific programme
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P: Plasmaphysik
P 15: Diagnostik 2; Niedertemperaturplasmen / Plasmatechnologie 5; Plasma-Wand Wechselwirkung 1
P 15.30: Poster
Tuesday, March 28, 2006, 17:00–19:00, Flure
Absolute Atomic Oxygen Density Measurements in the Effluent of an Atmospheric Pressure Plasma Jet (APPJ) by Two-Photon Laser-induced Fluorescence Spectroscopy — •St. Reuter, K. Niemi, V. Schulz-von der Gathen, and H.F. Döbele — Universität Duisburg-Essen, Fachbereich Physik, D-45141 Essen
The 13.56 MHz RF-excited plasma jet used in this work generates a homogeneous plasma in helium or argon with small admixtures (about 1 vol.-%) of oxygen. The temperature of the effluent is well below 100∘C. The jet operates at ambient conditions. Absolute concentrations of atomic oxygen have been measured in the effluent of the plasma jet by two-photon laser-induced fluorescence (TALIF). Even at several centimetre distance from the nozzle still there is 1% of the initial atomic oxygen density of 1016 cm−3 present[1]. The jet has been set up in a planar and a concentric version; both were compared by means of TALIF measurements. Emission spectroscopic measurements in the spectral range down to 110 nm have been carried out. Strong emission lines e.g. of atomic oxygen at 130 nm are observed up to a few centimetre outside the discharge. First investigations in changing the wetting behaviour of polymer Petri dishes have been carried out. The wettability could be adjusted in a wide range (wetting angle from 60∘ to below 10∘).
This work was supported by the "Ministerium für Wissenschaft und Forschung NRW" in the frame of the "Verbund plasmagestützte Oberflächenmodikation von medizin- und biotechnischer Bedeutung".
[1] K. Niemi, S. Reuter, V. Schulz-von der Gathen, and H.F. Döbele, Plasma Sources Sci. Technol. 14 (2005) 375