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Atmospheric pressure plasmas are effective sources for reactive species,making them applicable for industrial and biomedical applications. We quantifyground-state densities of key species, atomic oxygen (O) and hydrogen (H),produced from admixtures of water vapour (up to 0.5%) to the helium feed gas ina radio-frequency-driven plasma at atmospheric pressure. Absolute densitymeasurements, using two-photon absorption laser induced fluorescence, requireaccurate effective excited state lifetimes. For atmospheric pressure plasmas,picosecond resolution is needed due to the rapid collisional de-excitation ofexcited states. These absolute O and H density measurements, at the nozzle ofthe plasma jet, are used to benchmark a plug-flow, 0D chemical kinetics model,for varying humidity content, to further investigate the main formationpathways of O and H. It is found that impurities can play a crucial role forthe production of O at small molecular admixtures. Hence, for controllablereactive species production, purposely admixed molecules to the feed gas isrecommended, as opposed to relying on ambient molecules. The controlledhumidity content was also identified as an effective tailoring mechanism forthe O/H ratio.

plasma sources science and technology

The formation of atomic oxygen and hydrogen in atmospheric pressure  plasmas containing humidity: picosecond two-photon absorption laser induced  fluorescence and numerical simulations