Abstract By applying several packings in the discharge gap space, the peroxide formation through a silent discharge was studied. The peroxide concentration was higher in a void discharge tube or in a boric acid (boric oxide) packing-filled discharge tube and lower in the case of the soda glass and the ceramic packing containing titanium(IV) oxide. This was explained by the insufficient destruction of HO2 and H2O2 on the boric acid surface, and by the great destruction on the surface of the packing consisting of soda glass and ceramics. A kind of aging phenomena observed in the boric oxide packing was tentatively explained.
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