Ab initio potential energy curves and transition dipole moments for the low-lying singlet states of SiH+

The SiH+ ion was observed in the laboratory for the first time by Douglas and Lutz in 1970and it was detected in a solar photospheric spectrum in the same year from the emission ofthe SiH+ A1Π - X1Σ+ transition. Because of its astrophysical importance, it has been thesubject of several experimental, theoretical and astronomical investigations [1-4]. We reportab initio calculations on five singlet states of SiH+ using the multi-reference configurationinteraction (MRCI) method with large active space and basis sets. We have computedpotential energy curves, dipole moments and transition dipole moments for the X1Σ+, 11Π,11Δ, 21Σ+ and 21Π states of SiH+.