Ground-State Reduced Potential Curve (RPC) and the Anomaly of Cl2

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Abstract
The study of ground-state reduced potential curves indicates that either there is some error in the analysis of the spectrum and/or in the values of molecular constants of the Cl2 molecule or a nonnegligible perturbation of the ground state of Cl2 exists. In case the analysis of the spectrum and the values of the molecular constants are correct, the RPC method then leads to the following conclusion: The perturbation of the electronic states of halogens, predicted in order to explain the remarkably anomalous intensities of the band spectra, is, in I2, of the type proposed by Van Vleck whereas, for Cl2, the interpretation suggested by Mulliken holds.
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