Abstract
IN view of the considerable attention given to the secondary spectrum of hydrogen in recent investigations, it may be worth announcing that this spectrum has been extended photographically so far as 9300 Å.U. into the infra-red. Neocyanin plates were used, hypersensitised by an ammonia bath. About 170 additional lines to those recently published by Allibone (Proc. Boy. Soc. A., 112, 196, 1926) were measured, about 120 of these being above his uppermost limit. Some of the more intense lines beyond the highest values hitherto published are (Int. Å. U. vac.):
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POETKER, A. The Infra-Red Spectrum of Hydrogen. Nature 119, 123–124 (1927). https://doi.org/10.1038/119123c0
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DOI: https://doi.org/10.1038/119123c0
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