Abstract
IN the spectra of the gaseous nebulæ several very strong lines are found which have not been duplicated in any terrestrial source. Many lines of evidence point to the fact that the lines are emitted by an element of low atomic weight. Since the spectra of the light elements, as excited in terrestrial sources, are well known, this leads to the conclusion that there must be some condition, presumably low density, which exists in the nebulæ, that causes additional lines to be emitted.
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BOWEN, I. The Origin of the Nebulium Spectrum. Nature 120, 473 (1927). https://doi.org/10.1038/120473a0
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DOI: https://doi.org/10.1038/120473a0
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