Effects of humidity on the dynamics and electron recombination of a pin-to-pin discharge in He + H<sub>2</sub>O at atmospheric pressure

Brisset, Alexandra, Harris, Benjamin, Dickenson, Aaron, Niemi, Kari, Walsh, James ORCID: 0000-0002-6318-0892 and Wagenaars, Erik
(2022) Effects of humidity on the dynamics and electron recombination of a pin-to-pin discharge in He + H<sub>2</sub>O at atmospheric pressure. PLASMA SOURCES SCIENCE & TECHNOLOGY, 31 (4). 045008-045008.

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<jats:title>Abstract</jats:title> <jats:p>Control of the plasma chemistry is essential for the effectiveness of atmospheric pressure plasmas in many applications. For this, the effects of the humidity of the feed gas on the discharge chemistry need to be considered. Detailed studies are scarce and many of them are dominated by surface interactions, obscuring any volume effects. Here, a negative nanosecond pulsed discharge is generated in a pin–pin 3 mm gap geometry in He + H<jats:sub>2</jats:sub>O that enables the study of volume kinetics due to minimal surface area. The effect of humidity on the discharge development, electric field and electron density is investigated through experiments and modelling. It is found that the presence of water vapour affects both the electron density at the start of the pulse (remaining from the previous pulse) and the ionisation rates during the ignition phase, leading to a complex dependence of the discharge development speed depending on the water concentration. The electron decay is studied using the 0D global kinetics model GlobalKin. The dominant reactions responsible for the electron decay depending on the concentration of water vapour are determined by comparing experimental and simulated results and these reactions are grouped in simplified kinetic models. It is found that with water concentrations increasing from 0 to 2500 ppm, the complexity of the dominant reactions increases with in particular O<jats:sub>2</jats:sub> <jats:sup>+</jats:sup>, H<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> <jats:sup>+</jats:sup> and water clusters becoming important for high water concentrations. This work also provides experimental data for validation of kinetic models of plasmas in controlled environments.</jats:p>

Item Type: Article
Uncontrolled Keywords: nanosecond discharge, Stark broadening, electron recombination, electric field
Divisions: Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User: Symplectic Admin
Date Deposited: 07 Jun 2022 14:11
Last Modified: 17 Oct 2023 22:33
DOI: 10.1088/1361-6595/ac6130
Open Access URL: https://iopscience.iop.org/article/10.1088/1361-65...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3156017