Electron Emission from Thoriated Tungsten

Constants of the electron emission from a monatomic layer of thorium on tungsten at temperatures from 1000^ to 2000^. ---The electron emission for a monatomic layer of thorium on tungsten is best represented for zero field strength by the relation I=3T^2^-30, 500{T}, where I is expressed in amps/cm^2. The emission was measured for different states of activation of the filament. If we let be the fraction of surface covered with thorium, then for <0. 95 (approximately) logA_ varies linearly with b_ where the emission for the given surface is represented by I=A_T^2^-{b_{}T}. It is also pointed out that the emission for a monatomic film of thorium on tungsten is greater than that observed for metallic thorium.