Abstract
IT has been known for many years1–5 that when high current densities are drawn from vacuum tubes containing oxide-coated cathodes a green glow may be observed in the anode-cathode interspace. This discharge has been attributed to the presence of ionized barium and its occurrence has lent weight to the theory, now generally held, that the result of the process of activation of an oxide-coated cathode is to provide a stoichiometric excess of barium in the oxide lattice.
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