Abstract
RECENT investigations on the band spectrum of helium and the many-lined spectrum of hydrogen seem to show that there is a far-reaching analogy between the arrangement and location of the electronic states of the term systems of the spectra of He, He2, and H2. For the spectra of He and He2 this analogy has been discussed by Mullikan (Proc. Nat. Acad. Sci., 12, 158; 1925) and extended by the author (Proc. Nat.Acad. Sci., 13, 213; 1927). In regard to the correspondence between the electronic states of He and H2, Richardson demonstrated a remarkable agree-ment between the term values (see Table I.) of certain band groups of the many lined spectrum of H2 which he analysed (Proc. Roy. Soc., 113, 400; 1926) and the triplet system of the atomic helium spectrum In the case of He2 and H2 the analogy can be carried further in detail, due to the fact that under the usual conditions of excitation the band groups of the triplet system of He2 (‘Main-series’) and the corresponding groups in the many lined spectrum of hydrogen (Fuicher bands, etc., see Proc. Roy. Soc., 113, 368; 1926) appear in greater intensity than the band groups of the singlet system of He2 (Second series) and the corresponding groups of the many - lined spectrum of H2. Furthermore, there appear relatively many lines in the Q-branches of the band spectrum of He2 and in the many-lined spectrum of H2, while the P- and R-branches fade out with comparatively low rotational quantum numbers.
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SOMMER, L. Absorption Experiments on Excited Molecular Hydrogen. Nature 120, 841 (1927). https://doi.org/10.1038/120841a0
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DOI: https://doi.org/10.1038/120841a0
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