IN some recent papers 1, we have described a convenient method of determining the thermionic constants of metals. The method consists essentially in determining, at different known temperatures, the ...

Ubiquitous in the field of electric propulsion, thermionic hollow cathodes are electron sources which utilize thermionic emission from a low work function insert material to achieve large extracted ...

Proceedings of the National Academy of Sciences of the United States of America, Vol. 13, No. 2 (Feb. 15, 1927), pp. 56-60 (5 pages) ...

WHEN the work function of a metal is varied by depositing on its surface various amounts of a foreign substance (up to a complete monatomic layer), the ratio of secondary emission to primary current ...