Abstract
The energy level diagram is considered in the case of a Ba/SrO emissive cathode coating, and it is concluded from the results the preceding paper that the process of activation consists in building up a concentration of free barium in the coating, and in providing barium at the interface between core and coating. The work function of the activated coating without adsorbed barium on its outer surface cannot be much greater than the observed value of 1 eV., and may be no greater, so that such an adsorbed layer, if present, has only a small effect on the work function. The possibility of increase in emission under the influence of ultra-violet light or electron bombardment is briefly discussed.
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