Paper

Negative ion species in atmospheric-pressure helium dc glow discharge produced in ambient air

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Published 18 August 2020 © 2020 IOP Publishing Ltd
, , Citation Koichi Sasaki et al 2020 Plasma Sources Sci. Technol. 29 085012 DOI 10.1088/1361-6595/aba6a3

0963-0252/29/8/085012

Abstract

Experimental investigation on negative ions in atmospheric-pressure plasmas is insufficient to date. In this work, we examined negative ion species in atmospheric-pressure helium dc glow discharge produced in ambient air by laser photodetachment spectroscopy, where the pulsed increase in the discharge current was measured as a function of the laser wavelength. A major negative ion species was O which was originated from molecular oxygen in the ambient air. OH and Cl were also major negative ion species when we used an NaCl solution as the cathode of the dc discharge. ${\mathrm{O}}_{2}^{-}$ was minor in comparison with O, and H was negligible. The production process of OH was not dissociative electron attachment to H2O. The experimental results are consistent with the dominant production of OH due to dissociative electron attachment to H2O2.

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10.1088/1361-6595/aba6a3