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Spectral Analysis of Light emitted from an Oxide-coated Cathode during Thermionic Emission

IT has been known for many years 1–5 that when high current densities are drawn from vacuum tubes containing oxide-coated cathodes a green glow may be observed in the anode-cathode interspace. This discharge has been attributed to the presence of ionized barium and its occurrence has lent weight to...

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Bibliographic Details
Published in:Nature (London) 1962-01, Vol.193 (4820), p.1066-1066
Main Author: MEE, C. H. B.
Format: Article
Language:English
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Summary:IT has been known for many years 1–5 that when high current densities are drawn from vacuum tubes containing oxide-coated cathodes a green glow may be observed in the anode-cathode interspace. This discharge has been attributed to the presence of ionized barium and its occurrence has lent weight to the theory, now generally held, that the result of the process of activation of an oxide-coated cathode is to provide a stoichiometric excess of barium in the oxide lattice.
ISSN:0028-0836
1476-4687
DOI:10.1038/1931066a0