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Detection of HO2 in an atmospheric pressure plasma jet using optical feedback cavity-enhanced absorption spectroscopy
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Detection of HO2 in an atmospheric pressure plasma jet using optical feedback cavity-enhanced absorption spectroscopy
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Journal Article
Detection of HO2 in an atmospheric pressure plasma jet using optical feedback cavity-enhanced absorption spectroscopy
2016
Overview
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, HO2, 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 min of 2.25 × 10 − 10 cm−1 with a 100 second acquisition, equivalent to 5.5 × 10 12 cm − 3 of HO2 (under ideal conditions). Concentrations in the range of (3.1-7.8) × 1013 cm−3 were inferred in the 4 mm wide effluent of the plasma jet.
Publisher
IOP Publishing
