Abstract
IN 1924 one of us (L. V.)1 detected a number of phosphorescent bands produced when solidified mixtures of nitrogen with inert gases (argon or neon) were exposed to the bombardment of cathode rays. One of these bands, called N1, was situated in the region of the green auroral line. With diminishing nitrogen concentration the width of the line diminished and in pure neon it took the shape of a diffuse line with a wave-length 5577·4 A., which within the limit of error was identical with that2 of the auroral line 5577·35. From this result, Vegard concluded that he was actually observing the green auroral line, which, however, under certain conditions took the form of a phosphorescent band, due to the action of Van der Waals' forces3 between the molecules of the condensed system.
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References
Vegard, L., Kon. Akad. Wet. Amsterdam, 27 (1924).
Vegard, L., Ann. d. Phys., (4), 79, 377 (1926); (5), 6, 487 (1930).
Vegard, L., "The Influence of Van der Waals' Forces", etc., 225. Zeeman, Verhandlungen (Nijhoff, Hague, 1935).
Vegard, L., "Physics of the Earth", 8, 626 (Edit, by J. A. Fleming ).
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VEGARD, L., KVIFTE, G. The Green Auroral Line as an Initiator of Phosphorescence in Condensed Systems. Nature 162, 967–968 (1948). https://doi.org/10.1038/162967a0
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DOI: https://doi.org/10.1038/162967a0
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