Detection of HO2 in an atmospheric pressure plasma jet using optical feedback cavity-enhanced absorption spectroscopy. (16th November 2016)

• Record Type: Journal Article
• Authors: Gianella, Michele; Reuter, Stephan; Aguila, Ana Lawry; Ritchie, Grant A D; Helden, Jean-Pierre H van
• Is Part Of: New journal of physics. Volume 18:Number 11(2016:Nov.)
• Publication Date: 2016-11-16
• Subjects: atmospheric pressure plasma jet -- optical feedback cavity-enhanced absorption spectroscopy -- hydroperoxyl radical; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/18/11/113027
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: 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 α 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) × 10 13 cm −3 were inferred in the 4 mm wide effluent of the plasma jet.