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KINETICS OF HO₂ RADICAL IN NS PULSE O₂-He PLASMAS OVER A LIQUID WATER SURFACE AND UNDER ATMOSPHERIC PLASMA JET USING CAVITY RING DOWN SPECTROSCOPY
Telfah, Hamzeh
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https://hdl.handle.net/2142/122716
Description
- Title
- KINETICS OF HO₂ RADICAL IN NS PULSE O₂-He PLASMAS OVER A LIQUID WATER SURFACE AND UNDER ATMOSPHERIC PLASMA JET USING CAVITY RING DOWN SPECTROSCOPY
- Author(s)
- Telfah, Hamzeh
- Contributor(s)
- Adamovich, Igor V.
- Jans, Elijah R
- Raskar, Sai
- Issue Date
- 2023-06-23
- Keyword(s)
- Instrument/Technique Demonstration
- Abstract
- Time-resolved, absolute HO₂ number density in O₂-He mixtures excited by a repetitive ns pulse discharge over a pool of distilled water and in atmospheric pressure plasma jets is measured in situ by Cavity Ringdown Spectroscopy (CRDS). The discharge cell with external electrodes to generate the plasma and a water reservoir are integrated into the CRDS cavity. The experimental results are obtained at near room temperature, both during the discharge pulse burst and in the afterglow. The HO₂ number density is inferred from the CRDS data using a spectral model exhibiting good agreement with previous measurements of absolute HO₂ absorption cross sections. HO₂ is generated during the discharge burst and decays in the afterglow between the bursts, on a ms time scale. Comparison with the kinetic modeling predictions demonstrates good agreement with the data and identifies the dominant HO₂ generation and decay processes. HO₂ in the plasma is formed predominantly by the recombination of H atoms, generated by the electron impact of water vapor, with O₂ molecules. Reactions with O atoms and OH radicals are among the main HO₂ decay processes in the afterglow. CRDS was also be used for HO₂ measurements in atmospheric pressure plasma jets, where the jet is integrated in the Open-air Cavity, the mirrors were protected with purge. The HO₂ number density is inferred from the CRDS data using a spectral model exhibiting good agreement with previous measurements of absolute HO₂ absorption cross sections.
- Publisher
- International Symposium on Molecular Spectroscopy
- Type of Resource
- Text
- Genre of Resource
- Conference Paper / Presentation
- Language
- eng
- Handle URL
- https://hdl.handle.net/2142/122716
- DOI
- https://doi.org/10.15278/isms.2023.7349
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