Title :
Enhanced efficiency of atomic oxygen generation in a single-electrode, 5NS pulsed microplasma jet
Author :
Lane, Jamie ; Shutong Song ; Neuber, Johanna ; Chunqi Jiang ; Sanders, Jason ; Kuthi, Andras ; Gundersen, Martin A.
Author_Institution :
Frank Reidy Res. Center for Bioelectrics, Old Dominion Univ., Norfolk, VA, USA
Abstract :
Summary form only given. A single-electrode, 5 millimeter long, 500 micrometer-in width, helium plasma jet was generated in ambient atmosphere when the electrode was excited with 5 ns, 8 kV pulses at 500 Hz. Optical emission spectroscopy (OES) showed that the production of excited atomic oxygen increased by a factor of 2 for the 5 ns pulsed plasma jet when compared with that for a 164 ns pulsed plasma jet operating at the same voltage, amplitude, and flow conditions. This signifies an enhanced efficiency of atomic oxygen production using the 5 ns pulsed plasma with faster rise time, as the energy per pulse was 0.12 mJ, which had only 8 % more energy per pulse than that of the longer pulsed version. Emission due to excited species including He, O, H, OH, N2 (C-B) and N2+ (B-X) were observed in both of the discharges within the first 1 mm (from the tip of the electrode) of the jet. All of the emissions, except from that of N2 second positive system, decayed rapidly with the distance. Analysis of the rovibronic emission from N2 (CB) showed both the nanosecond plasma jets have a rotational temperature of 300 K and a vibrational temperature of 3000 K.
Keywords :
electrodes; helium; hydrogen; nitrogen; oxygen; oxygen compounds; plasma diagnostics; plasma jets; plasma temperature; H; He; N2 second positive system; N2; O; OES; OH; atomic oxygen generation enhanced efficiency; discharges; excited atomic oxygen; excited species; frequency 500 Hz; optical emission spectroscopy; rotational temperature; rovibronic emission; single-electrode 5NS pulsed microplasma jet; temperature 300 K; temperature 3000 K; time 164 ns; time 5 ns; vibrational temperature; voltage 8 kV; Atom optics; Electrodes; Helium; Oxygen; Plasma temperature; Production;
Conference_Titel :
Plasma Sciences (ICOPS), 2015 IEEE International Conference on
Conference_Location :
Antalya
DOI :
10.1109/PLASMA.2015.7179944