Abstract
THE emission of secondary electrons from metals by positive ions has been studied by a number of workers1, and it has been established that the efficiency of this process depends upon the work function of the metal, the ionization potential of the ion and their kinetic energy. It is believed that a positive ion becomes neutralized before it actually comes into contact with the metal by extracting an electron from it and is in the excited state when it enters its surface. The energy of excitation of the atom is handed over to another free electron of the metal as it settles down to its ground-state in a radiationless process2. This electron escapes from the metal as a secondary emission.
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References
Oliphant, M. L., Proc. Roy. Soc., A, 127, 373 (1930). Moon, P. B., Proc. Camb. Phil. Soc., 27, 570 (1931). Penning, Proc. Amst. Acad., 33, 841 (1930). Chaudhri, R. M., Proc. Camb. Phil. Soc., 28, 349 (1931).
Oliphant, M. L., and Moon, P. B., Proc. Roy. Soc., A, 127, 388 (1930). Massey, H. S. W., and Burhop, E. H. S., “Electronic and Ionic Impact Phenomena”, 541 (Clarendon Press, Oxford, 1952).
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CHAUDHRI, R., KHAN, M. & TASEER, A. Emission of Photo Radiations by the Impact of Positive Ions of Helium on Nickel. Nature 177, 1226–1227 (1956). https://doi.org/10.1038/1771226a0
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DOI: https://doi.org/10.1038/1771226a0
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