Abstract
The density of singlet delta oxygen is measured in situ in a He/O2 atmospheric-pressure plasma jet using optical emission spectroscopy at 1.27 μm. A sinusoidal high voltage of 1–10 kHz is applied between two electrodes wrapped around a quartz tube, in which the working gas flows. The two-dimensional distribution of the density shows that is primarily produced in the dielectric barrier discharge inside the quartz tube and that the production in the plasma jet plume is negligibly small. Typically, 100 ppm of is produced. The density increases with O2 concentration and is proportional to the specific input energy (SIE; J/l) irrespective of the discharge voltage, frequency, and gas flow rate. The production per SIE was 10 ppm/(J/l). The loss processes of via reactions with O3 and O2 are discussed. The density decreases when the working gas is humidified. An addition of 200 ppm of H2O decreases the density by half.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
