Cold non-equilibrium atmospheric pressure plasma jets are increasingly applied in material processing and plasma medicine. However, their small dimensions make diagnosing the fluxes of generated species a challenge. Here we report on the detection of the hydroperoxyl radical, HO 2 , in the effluent of a plasma jet by the use of optical feedback cavity-enhanced absorption spectroscopy. The spectrometer has a minimum detectable absorption coefficient of cm −1 with a 100 second acquisition, equivalent to of HO 2 (under ideal conditions). Concentrations in the range of (3.1–7.8) × 10 13 cm −3 were inferred in the 4 mm wide effluent of the plasma jet.
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Gianella et al. (2016) studied this question.
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