Mass Spectrometry
Online ISSN : 2186-5116
Print ISSN : 2187-137X
ISSN-L : 2186-5116
Original Article
Corona Discharge and Field Electron Emission in Ambient Air Using a Sharp Metal Needle: Formation and Reactivity of CO3−• and O2−•
Kenzo HiraokaStephanie Rankin-TurnerSatoshi NinomiyaHaruo ShimadaKazumasa KinoshitaShinichi Yamabe
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Supplementary material

2021 Volume 10 Issue 1 Pages A0100


CO3−• and O2−• are known to be strong oxidizing reagents in biological systems. CO3−• in particular can cause serious damage to DNA and proteins by H abstraction reactions. However, H abstraction of CO3−• in the gas phase has not yet been reported. In this work we report on gas-phase ion/molecule reactions of CO3−• and O2−• with various molecules. CO3−• was generated by the corona discharge of an O2 reagent gas using a cylindrical tube ion source. O2−• was generated by the application of a 15 kHz high frequency voltage to a sharp needle in ambient air at the threshold voltage for the appearance of an ion signal. In the reactions of CO3−•, a decrease in signal intensities of CO3−• accompanied by the simultaneous increase of that of HCO3 was observed when organic compounds with H–C bond energies lower than ∼100 kcal mol−1 such as n-hexane, cyclohexane, methanol, ethanol, 1-propanol, 2-propanol, and toluene were introduced into the ion source. This clearly indicates the occurrence of H abstraction. O2−• abstracts H+ from acid molecules such as formic, acetic, trifluoroacetic, nitric and amino acids. Gas-phase CO3−• may play a role as a strong oxidizing reagent as it does in the condensed phase. The major discharge product CO3−• in addition to O2−•, O3, and NOx that are formed in ambient air may cause damage to biological systems.

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© 2021 Kenzo Hiraoka, Stephanie Rankin-Turner, Satoshi Ninomiya, Haruo Shimada, Kazumasa Kinoshita, and Shinichi Yamabe. This is an open-access article distributed under the terms of Creative Commons Attribution Non-Commercial 4.0 International License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

This article is licensed under a Creative Commons [Attribution-NonCommercial 4.0 International] license.
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