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Abstract
Ab initio CI calculations are presented for potential curves for the valence states of HCl, for the vertical electronic spectrum and for the potential curve for the B 1Σ+ state. The valence 1Π, 3Π and 3Σ+ states are found to be repulsive. Calculated vertical excitation energies are in good agreement with experiment. The B 1Σ+ curve is predicted to have a double minimum.