Abstract
IN the course of a series of photographs of the spectrum of the auroral afterglow in pure nitrogen at pressures varying from about 1 mm. to 0.01 mm., it was observed that the ratio of the intensity of the first-negative system of bands to that of the second-positive system changed gradually as the pressure changed. The first negative bands, which are emitted by the molecule ion, increased in intensity until, at the lowest pressure at which it was possible to photograph the afterglow, the spectrum consisted almost entirely of bands due to the ionized molecule.
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KAPLAN, J. Measurement of Pressures in the Upper Atmosphere. Nature 139, 1112 (1937). https://doi.org/10.1038/1391112b0
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DOI: https://doi.org/10.1038/1391112b0
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