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This paper calculates the potential energy curves of the 14 Λ-S and 49 Ω states, which come from the first three dissociation channels of the SiN - anion. These calculations are conducted using the valence internally contracted multireference configuration interaction and the Davidson correction approach. Core-valence correlation and scalar relativistic corrections are taken into account. The potential energies are extrapolated to the complete basis set limit. The spin-orbit coupling is computed using the state interaction approach with the Breit-Pauli Hamiltonian. We found that the X¹Σ⁺ ( υ '' = 0-23) and a³Σ⁺ ( υ ' = 0-2) states of SiN - are stable at the computed adiabatic electron affinity value of 23,262.27 cm -1 for SiN. Based on the calculated potential energy curves, the spectroscopic parameters and vibrational levels were determined for all stable and metastable Λ-S and Ω states. The computed adiabatic electron affinity of SiN and the spectroscopic constants of SiN - (X¹Σ⁺) are all in agreement with the available experimental data. The d³Σ⁺, 2⁵Σ⁺, 1⁵Δ, and 1⁵Σ - quasi-bound states caused by avoided crossings were found. Calculations of the transition dipole moment of a³Σ⁺₁ to X¹Σ⁺ 0+ are shown. Franck-Condon factors, Einstein coefficients, and radiative lifetimes of the transition from the a³Σ⁺₁ ( υ ' = 0-2) to the X¹Σ⁺ 0+ state are evaluated.

icMRCI+Q Study of the Spectroscopic Properties of the 14 Λ-S and 49 Ω States of the SiN− Anion in the Gas Phase