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What is the main physical mechanism behind the generation of negative ions in air by a high negative voltage electrode ?

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    $\begingroup$ Well, the main mechanism is attaching an electron to a neutral molecule... Can you be a little more specific about what you want to understand? This is a pretty broad question. $\endgroup$
    – Jon Custer
    Commented Oct 21, 2015 at 18:16
  • $\begingroup$ @JonCuster: what is the physical mechanism in order to generate free electrons? I like to understand the physics in order to design an ionizer. $\endgroup$
    – Ramin IJ
    Commented Oct 21, 2015 at 20:03
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    $\begingroup$ Field emission from the electrode would be one good bet. And, if you get one free electron in a strong field you likely will get avalanche effects, multiplying the number of free electrons. One search term is 'corona current'. $\endgroup$
    – Jon Custer
    Commented Oct 21, 2015 at 20:07

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