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The spectral emittance of nickel- and oxide-coated nickel cathodes

S L Martin and G F Weston

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The spectral emittance values at a wavelength λ = 0.66 μ have been measured for various types of oxide-coated cathode, and for nickel cores, using a cylindrical diffuse reflectometer. The influence of various factors, essentially affecting the surface condition, on the emittance has been examined. Tables show for nickel the effect of stoving treatment, temperature, and getter flash; and for oxide-coated cathodes the strong effect of the oxide surface texture, and the subsidiary effects of glass tube baking temperature, and getter flash.


PACS

79.40.+z Thermionic emission

68.35.Bs Structure of clean surfaces (reconstruction)

68.47.Gh Oxide surfaces

81.65.Tx Gettering

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Dates

Issue 12 (December 1950)

Received 7 July 1950



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