Abstract
THE afterglow in the remarkable nitrogen tube described by me1 last year has been photographed in the visible region. A reference to that paper will show that the visible spectrum of the discharge consists of the first-negative and the first-positive bands of nitrogen, with only a trace of the second-positive bands. The normal spectrum of a nitrogen discharge under the pressure and excitation conditions of my experiment consists of the second-positive and the first-positive bands. The striking change in the spectrum of the discharge itself is carried over to the afterglow.
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References
Kaplan, Phys. Rev., 42, 807; 1932.
L. A. Sommer, Z. Phys., 57, 582; 1929.
Kaplan, Phys. Rev., 33, 154; 1929.
Vegard, Skrifter Utgitt av det NorsJce Videnskamps Akad. i Oslo, 2, 24; 1930; and NATURE, 132, 682; Oct. 28, 1933.
Phys. Rev., in press.
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KAPLAN, J. Light of the Night Sky and Active Nitrogen. Nature 132, 1002–1003 (1933). https://doi.org/10.1038/1321002b0
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DOI: https://doi.org/10.1038/1321002b0
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