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that he observed in a hydrogen-helium mixture in 1912. Analysis by Niels Bohr included in his 'trilogy' on atomic structure argued that the spectral lines arose from ionized helium, He⁺, and not from hydrogen.
Fowler was initially-skeptical but was ultimately convinced that Bohr was correct, and by 1915 "spectroscopists had transferred [the Pickering series] definitively [from hydrogen]

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