The spectroscopic properties of the fundamental and several excited states of Sr + Ar and SrAr, Van der Waals systems are investigated by employing an ab initio method in a pseudo-potential approach. The potential energy curves and the spectroscopic parameters are displayed for the 1-10 2 Σ + , 1-6 2 Π and 1-3 2 Δ electronic states of the Sr + Ar molecule and for the 1-6 1 Σ + , 1-4 3 Σ + , 1-3 1,3 Π and 1-3 1,3 Δ states of the neutral molecule SrAr. In addition, from these curves, the vibrational levels and their energy spacing are deduced for Σ + , Π and Δ symmetries. The spectra of the permanent and transition dipole moments are studied for the 1,3 Σ + states of SrAr, which are considered to be two-electron systems and 2 Σ + states of the single electron Sr + Ar ion. The spectroscopic parameters obtained for each molecular system are compared with previous theoretical and experimental works. A significant correlation revealed the accuracy of our results.
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