Abstract
Despite the simplicity of the K2+ alkali dimer with a single active electron, comparison of the ab initio results of Berriche et al. (2008) with those of Magnier and Frécon (2003) based on a model potential approach reveals a number of serious disagreement concerning several excited states. In particular, the 52Σu+, 62Σg+, 62Σu+, 72Σg+, 72Σu+, 32Πg, 42Πg and 22Δu states which are found to be repulsive by Magnier and Frécon, but attractive when ab initio techniques are employed. To clarify the origin of this disagreement, the adiabatic energies and spectroscopic constants are re-computed for the low-lying states of the K2+ alkali dimer within a model potential framework. Contrary to the claims of Magnier and Frécon, the new results based on a model potential approach agree well with the ab initio ones.
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