The detection of transient species in atmospheric pressure plasma jets is still a challenge, especially due to the small geometries of such plasmas. We have overcome these limitations by using cavity-enhanced absorption spectroscopy (CEAS) and optical feedback CEAS instruments to detect stable CH4 as well as the highly reactive HO2 species in two types of plasma jets. We show that with these methods spatially resolved investigations of concentrations in the mm sized effluent of the plasma jet can be achieved.

© 2016 Optical Society of America

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