Creating free superoxide in air

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genekuli
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this question relates to creating free superoxide so it is not a superoxide of anything. another more un-accurate but common name for it is a negative air ion.
in air, ozone is always going to be co-created in any process that creates superoxide.
a HV electrode (-) in air produces mostly ozone and superoxide. but how to make the superoxide without the ozone?
would a helium jet directed onto the HV cathode prevent the ozone being formed and allow the electrons to temporally stay in the helium until they contact oxygen and get transferred to the oxygen (as oxygen is electronegative) thereby creating free superoxide?
[[info: oxygen needs to be in the corona of the HV cathode for ozone to be formed due to the UV and strong electric fields. whereas superoxide needs only for oxygen to come in contact with free electrons.]]
 
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this question relates to creating free superoxide; so it is not a superoxide of anything. another more un-accurate but common name for it is a negative air ion.