Abstract

Mass spectrometric studies of ionic species formed in negative corona discharges in air and pure oxygen have been carried out at total pressures ranging from 5 Torr to 760 Torr. In air, the importance of trace amount of carbon dioxide is demonstrated by the dominant presence CO3⁻ ion at pressures above 50 Torr. This ion comprises over 90% of the total ionic species which reach the anode at atmospheric pressure. At relative humidities of 20–50%, the contributions of the hydrated species such as CO₃⁻(H₂O), O⁻(H₂O), and O₃⁻(H₂O) are less than 10%. In pure oxygen the two important ionic species appear to be O3⁻ and O⁻ with the contribution of the former increasing with pressure. Trace impurities of carbon dioxide in oxygen, however, convert the carriers to CO3⁻ which makes the dominant contribution to the total current.

© 1969 Optical Society of America

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