Abstract
IN 1924, L. Vegard1 directed attention to the occurrence of phosphorescent bands in the region of the auroral line at 5577·35 A. when a solidified mixture of nitrogen and argon or neon is exposed to cathode-ray excitation. In a recent communication, Vegard and Kvifte2 report an observation of J. Nordhagen that pure argon at atmospheric pressure shows a green luminescence when excited by a Tesla transformer. Vegard and Kvifte suggest that the green band is a phosphorescent phenomenon initiated by the oxygen auroral line at 5577·35 A. They point out that increase in oxygen concentration above a certain value (not stated) suppresses the green phosphorescence.
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References
Vegard, L., Kon. Akad. Wet. Amsterdam, 27 (1924).
Vegard, L., and Kvifte, G., Nature, 162. 967 (1948).
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JENKINS, H., BOWTELL, J. & STRONG, R. Afterglow Phenomena in Argon–Nitrogen Mixtures at Pressures Close to Atmospheric. Nature 163, 401–402 (1949). https://doi.org/10.1038/163401a0
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DOI: https://doi.org/10.1038/163401a0
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