Abstract
ACCORDING to Samuel and co-workers1, atoms of the second group of the Periodic System are chemically inert in their helium-like ground term 1S. Linkage becomes possible only in an excited atomic term. Among many diatomic molecules (oxides and chlorides) of this group, cadmium fluoride (CdF), from its emission bands2, is claimed to be a very conclusive example of this kind of linkage. Other investigations on the spectra of the diatomic halides of mercury, cadmium and zinc3 4, however, make it probable that the ground state of these molecules is built up from unexcited atoms.
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References
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Asundi, Samuel and Zakki-Uddin, Proc. Phys. Soc., 47, 235 (1935).
Sponer, Z. phys. Chem., B, 11, 425 (1931). Oeser, Z. Phys., 95, 699 (1935).
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WIELAND, K. Spectrum of Mercury Chloride (HgCl) and Samuel's Theory of Linkage. Nature 139, 590–591 (1937). https://doi.org/10.1038/139590b0
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DOI: https://doi.org/10.1038/139590b0
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