Abstract
The opto-galvanic signal (OGS) induced through ArII (4s–4p) transitions in Ar/Al hollow cathode discharge (HCD) is studied. The signal is found influenced by Penning's process. The light-induced ionization is calculated as a negligible contribution to the conductivity. The γ-process of ion-secondary electrons generation in HCD is analyzed related to the ionic OGS. The later is ascribed to the light-induced intensification of ion→secondary electron production based on the higher potential energy of the photoexcited Ar + ion.
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