Abstract
THE equilibrium internuclear distance re and the vibration frequency e for diatomic molecules were connected by Morse in the formula ere3 = const. = 3.000 × 1021 cm.2 for many molecules. This, however, does not hold accurately, and in fact the constant shows a periodic error. Douglas Clark has proposed a modified formula, ere3n = const., where n is the group number, and is the number of shared electrons, usually the sum of the valency electrons in the atoms composing the molecule. This constant varies for each molecular period, and appears to be quite arbitrary. Neither of these formulæ is capable of fitting the case of isotopes, for which re has the same value, while e depends on the reduced mass.
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ALLEN, H., LONGAIR, A. Internuclear Distance and Vibration Frequency for Diatomic Molecules. Nature 135, 764 (1935). https://doi.org/10.1038/135764a0
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DOI: https://doi.org/10.1038/135764a0
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