On the mechanism of operation of the type B impregnated cathode

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Abstract
Hitherto unpublished data on life tests and evaporation rate of total barium from type B impregnated cathodes are presented. These data conflict with the recently deduced conclusion of Forman that the cathode surface is covered with less than a monlayer of adsorbed barium and that the barium coverage decreases with time. However, they are in agreement with the cathode mechanism proposed by Rittner and co‐workers based upon extensive experimental studies. The Forman erroneous conclusion is traced to an inadequate oxygen content of the monolayer in synthesized cathode surfaces intended to simulate the real cathode.