On the Structure of the D3 Line of Helium

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DUE to the position of helium in the periodic table, relative to that of the alkaline earth metals, it has been frequently pointed out that its spectrum should consist of systems of singlets and triplets instead of the observed singlets and doublets. An unsuccessful attempt has been made to resolve the strong component of the doublet into the two expected components with the expected separation of approximately 0.17 Å.U., since the separation of the observed components is 0.34 Å.U. approximately.

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