Abstract
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 is found to change in the same sense as the thermionic emission, but to a much less degree. This difference of behaviour is due to the fact that the secondaries are emitted with velocities much greater than those of the thermally emitted electrons.
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References
L. J. Haworth, Phys. Rev., 48, 88 (1935).
H. E. Farnsworth, Phys. Rev., 31, 414 (1928).
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TRELOAR, L. Relation between Secondary Emission and Work Function. Nature 137, 579 (1936). https://doi.org/10.1038/137579a0
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DOI: https://doi.org/10.1038/137579a0
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