Abstract
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 +, 1-6 2 and 1-3 2Δ electronic states of the Sr+Ar molecule and for the 1-6 1 +, 1-4 3 +, 1-3 1,3 and 1-3 1,3Δ states of the neutral molecule SrAr. In addition, from these curves, the vibrational levels and their energy spacing are deduced for +, and Δ symmetries. The spectra of the permanent and transition dipole moments are studied for the 1,3 + states of SrAr, which are considered to be two-electron systems and 2 + 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.