Configuration interaction study of the electronic states and spectroscopic properties of selenium monoxide

► Selection of basis sets and relativistic effective core potentials (RECP) of Se and O atoms. ► Computation of MRDCI calculations without and with considering effect of spin-orbit coupling. ► Construction of potential energy curves without and with spin-orbit effect. ► Computation of spectroscopic constants in both the cases. ► Computation of transition probabilities of some transitions and dipole moments.