Characterization of a kHz sinusoidal Argon plasma jet impinging on water using Thomson scattering and fast imaging

Slikboer, Elmar and Walsh, James ORCID: 0000-0002-6318-0892
(2021) Characterization of a kHz sinusoidal Argon plasma jet impinging on water using Thomson scattering and fast imaging. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 54 (32). p. 325201.

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<jats:title>Abstract</jats:title> <jats:p>The electron dynamics in a stable and non-filamentary Argon plasma jet, generated using AC excitation at kHz frequencies and interacting with a liquid surface either at floating potential or electrically grounded were examined using laser Thomson scattering. In the case of a floating liquid, two discharge events were observed during each half-cycle of the applied sinusoidal voltage. In the grounded liquid case only one discharge event was observed, which occurred during the positive half period. Through spatio-temporal imaging of the discharge, its repetitive breakdown behavior was analyzed and divided into pre-, main-, and post-breakdown phases. The dynamics and presence of the various phases differed depending upon the grounding of the liquid. Thomson scattering measurements revealed maximum electron densities and temperatures of 6.0–6.3 × 10<jats:sup>14</jats:sup> cm<jats:sup>−3</jats:sup> and 3.1–3.3 eV for the floating liquid case and 1.1 × 10<jats:sup>15</jats:sup> cm<jats:sup>−3</jats:sup> and 4.3 eV in the grounded liquid case. Electron-driven reactions are the primary source of reactive chemical species in a plasma jet. Therefore, the electrical characteristics of the liquid sample can impact the fundamental physicochemical processes at play in the discharge, ultimately influencing its chemical composition.</jats:p>

Item Type: Article
Uncontrolled Keywords: atmospheric pressure plasma, Thomson scattering, argon plasma jet, kHz sinusoidal excitation
Divisions: Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User: Symplectic Admin
Date Deposited: 17 Jan 2022 16:05
Last Modified: 18 Jan 2023 21:15
DOI: 10.1088/1361-6463/ac0070
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