HO2 reaction kinetics in an atmospheric pressure plasma jet determined by cavity ring-down spectroscopy

Journal article

Hydroperoxyl (HO₂) is detected in the effluent of an atmospheric pressure plasma jet by cavity ring-down absorption spectroscopy. Laser radiation at 1506.4 nm is used to determine HO₂ concentrations directly in the plasma effluent at atmospheric pressure as well as indirectly after sampling through a pinhole and expanding to 5.33 kPa. To unravel the HO₂ reaction kinetics, the argon feed gas is humidified and the plasma jet is equipped with a gas curtain device that controls the surrounding atmosphere. Varying the curtain gas composition from pure nitrogen to pure oxygen leads to a five to six-fold increase in HO₂ concentrations towards higher oxygen concentrations. A reaction kinetics model considering near-field and far-field reactions describes the reaction pathways that determine the hydroperoxyl concentration and is in good agreement with the measurements at both low and atmospheric pressure.

Authors: Gianella, M; Reuter, S; Gianella, M; Press, S; Schmidt-Bleker, A

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: IOP Publishing
• Journal: Plasma Sources Science and Technology
• Volume: 27
• Issue: 9
• Article number: 095013
• Publication date: 2018-09-05
• Acceptance date: 2018-09-05
• DOI: 10.1088/1361-6595/aadf01
• EISSN: 1361-6595
• ISSN: 0963-0252