Abstract
The optogalvanic (OG) reaction induced by ion transitions in an Ar/Mg hollow-cathode discharge is interpreted as conductivity due to production of additional secondary electrons. The irradiated ion extracts secondary electrons more effectively from the Mg cathode surface. This OG mechanism has not been considered to date. The observed additional polarization (self-alignment) of the Ar I 794.8 nm spectral line is taken as a confirmation of this process.
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