Connection between energy relations of solids and molecules

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Abstract
The universal energy relation, discovered for metallic and covalent solids as well as nuclear matter, is tested for diatomic molecules. We find that it applies well to covalent diatomic bonds, but that ionic diatomic bonds are in a distinct class. A simple extension of the universal binding energy relation that includes the effects of ionicity ensues. It yields accurate predictions of spectroscopic data for both ionic and covalent bonds in 150 molecules. The form of the covalent part is given by the universal relation, suggesting an intimate relationship between the energetics of solids and diatomic molecules.