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. 2014 Oct 16;4:6638. doi: 10.1038/srep06638

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(A) Optical emission spectrum of the plasma plume from 250 nm to 850 nm observed in the helium/oxygen plasma at the applied voltage 1.7 kV_pp, repetition frequency 50 kHz, and duty ratio 10%. (B) Comparisons of the change of the emission intensities from NO, OH, H_α, O radicals in different oxygen flow rates increasing from 0 to 100 SCCM. (C) The intensity ratios of the lines from NO, OH, H_α, O radicals to the helium line (706 nm). (D) Measurement of ozone concentration for different oxygen flow rates increasing from 0 to 20 SCCM.