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Examples of atmospheric pressure plasma jet: (a) Schematic set-up of the atmospheric pressure plasma jet [47]; (b) Photograph of the modified plasma jet with two different shielding gas conditions [48]; (c) Measured and simulated optical emission spectra around the OH line at 309 nm for the sub-microsecond pulsed atmospheric argon plasma jet [46]; Reprinted with permission from Refs. [[46], [47], [48]].
