The electronic spectrum of the silicon monoxide molecule has been studied theoretically by using ab initiobased multireference singles and doubles configuration interaction calculations, which include the effective core potentials of the atoms. Potential energy curves of all 18 states, which correlate with the lowest dissociation limit Si( 3 P g ) + O( 3 P g ), are constructed. Spectroscopic parameters, namely, T e , r e , and ω e of a large number of bound Λ-S states of the molecule, are estimated and compared with the available experimental and other theoretical data. In addition, dissociation energies and dipole moments of the ground and some excited states are computed. The changes in the spectroscopic properties and potential energy curves after the inclusion of the spin-orbit coupling are discussed. Transition probabilities of many dipole-allowed and spin forbidden transitions are reported. The radiative lifetimes of some of the excited states such as A 1 Π, E 1 Σ + , and 2 1 Π are estimated and compared with the experimental results. Dipole moments (µ) and dipole derivatives (∂µ/∂r) of the molecule in X 1 Σ + , a 3 Σ + , b 3 Π, A 1 Π, and E 1 Σ + states as a function of the bond distance have been computed.

Ab initio based configuration interaction calculations using relativistic effective core potentials and compatible basis sets have been performed to study the electronic spectrum of the silicon monosulfide molecule. Potential energy curves of low-lying states of SiS have been computed. Spectroscopic properties of many observed states such as X

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