HIGHLIGHTS
SUMMARY
There is an intermediate regime, when only a limited access of atmosphere is provided, e_g, pressed anode configuration. Under a high voltage applied to the needle, plasma discharge between the anode and the specimen surface provides a large number of hydrogen/hydronium_ions generated from atmospheric water vapor. Applying sufficiently high voltage results in a resistive (because of thermal activation of the glass conductivity) barrier DC plasma discharge in the gap, which generates hydrogen/hydronium_ions penetrating into the glass, the number of which is less for lower voltages. Particularly, higher resistive glasses (e_g, glasses with . . .
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