Diagnostics on nitric oxide and hydroxyl radical in an atmospheric pressure argon plasma jet

Nitric oxide (NO) is a chemically active specie that plays a vital role in many biomedical applications. Measuring NO density in the atmospheric pressure plasma jet is challenging. Optical emission spectroscopy (OES) can be used to get the relative intensity of the excited levels of NO, while absorption spectroscopy and laser-induced fluorescence (LIF) can be used for time-resolved and spatially-resolved NO measurements in the effluent of an argon plasma jet. The NO generation in the gas phase plasma can also be related to the production of reactive nitrogen and oxygen species (RONS) in the plasma-activated water, which guides the efficient creation and transport of reactive species from the gas phase to the liquid phase. Therefore, the project possibly could involve one or two of the following aspects: a) NO measurements based on absorption spectroscopy and OES; b) The calibration of NO density with a known concentration of NO-contained gas mixture conducted under the same LIF experimental condition; c) Plasma water treatment and analysis of the relationship between gas phase NO and liquid phase RONS.