Energies and electric dipole moments of the low lying electronic states of the alkaline earth monohalides from an electrostatic polarization model

A simple electrostatic polarization model is applied to the low lying electronic states A 2 Π, B 2 ∑+, and A′ 2 Δ of the alkaline earth monohalides which correlate to the electronic d state of the free metal ion. The number of fit parameters can be greatly reduced using relations which are derived from the well known angular part of the free ion wave function. The model predicts energies and electric dipole moments for all Ca, Sr, and Ba monohalides in good agreement with experimental data. The model can also be applied to the C state confirming the highly ionic character of this state.