Abstract
ABSTRACT There is a definite need for a methodical analysis of the omission pattern from conventional oxide cathodes. Photographic recording of emission processes is intended from the 21 in. screen of a thermionic emission microscope. With a triple-carbonate coating on a, passive ultra-pure nickel base activation is left to temperature effects and electrolysis. The high field adds a significant component, so that with only 635°C ample beam current is emitted for a 21 in. diameter image display. Conglomerations of triple-oxide crystallites of an average diameter of 3 μrepresent the individual emission site3 with the larger particles always producing higher intensities because of their larger activator reservoir. A quasi layer-wise particle emission was found to prevail consisting of a maximum of three layers, each becoming successively prominent with increasing field and/or temperature, until they emit in unison at 705/c. This is explained by potential-shielding of top layers bridging voids and blocking fi...
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