Imaging Measurements of Absolute OH and H2O2 Concentrations in a HE-H2O NS-Pulsed Atmospheric Pressure Plasma Jet by Photo-Fragmentation Laser-Induced Fluorescence

Electrical discharges in humid media are of great interest in biomedical and environmental applications, such as plasma medicine, disinfection, gas treatment, and removal of volatile organic contaminants. Plasmas in high water content produce a mixture of highly reactive species, including reactive oxygen species that are strongly oxidative. We investigate two key reactive species: hydroxyl radical (OH) and hydrogen peroxide (H 2 O 2 ) using time-resolved 2D imaging in the afterglow of a dielectric barrier discharge plasma in humid helium, powered by a ns-pulser. The stagnation discharge plane is created by introducing the feed gas concentrically through the powered electrode which impinges on a grounded steel surface.