Researchers have developed and demonstrated a new diagnostic technique for obtaining local distribution of gas phase hydrogen peroxide (H2O2) in plasma jets. Continuous-wave cavity ringdown spectroscopy, with a quantum cascade laser at a wavelength of 8.12 μm, is used to determine the effective absorption length of a cold atmospheric pressure plasma jet and to determine the localized density of H2O2 in the effluent of the plasma jet.
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