Dependence of negative ion formation on inhomogeneous electric field strength in atmospheric pressure negative corona discharge |
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Authors: | K Sekimoto M Takayama |
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Institution: | (1) International Graduate School of Arts and Sciences, Yokohama City University, Yokohama 236-0027, Japan |
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Abstract: | The dependence of negative ion formation on the inhomogeneous electric field
strength in atmospheric pressure negative corona discharge with
point-to-plane electrodes has been described. The distribution of negative
ions HO-, NOx
- and COx
- and their abundances on the
plane electrode was obtained with a mass spectrometer. The ion distribution
on the plane was divided into two regions, the center region on the needle
axis and peripheral region occurring the dominant NOx
- and
COx
- ions and HO- ion, respectively. The calculated electric
field strength in inhomogeneous electric field established on the needle tip
surface suggested that the abundant formation of NOx
- and
COx
- ions and HO- ion is attributed to the high field
strength at the tip apex region over 108 Vm-1 and the low field
strength at the tip peripheral region of the order of 107 Vm-1,
respectively. The formation of HO-, NOx
- and COx
-
has been discussed from the standpoint of negative ion evolution based on
the thermochemical reaction and the kinetic energy of electron emitted from
the needle tip. |
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Keywords: | PACS" target="_blank">PACS 52 80 Hc Glow corona 82 33 Xj Plasma reactions (including flowing afterglow and electric discharges) 82 30 Fi Ion-molecule ion-ion and charge-transfer reactions 82 33 Tb Atmospheric chemistry |
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