Spectroscopic properties of low-lying excited electronic states for CF^- anion based on ab initio calculation

CF^- anion is very important for collisional ionization reactions, electron transfer from Rydberg atoms and electron attachment. Potential energy curves (PECs) of five low-lying excited electronic states, X³Σ^-, a¹Δ, b¹Σ⁺, A³Π and c³¹Π of CF^-, are calculated by using the internally contracted multireference configuration interaction (icMRCI) approach. Ro-vibrational levels of these electronic states are derived through solving the radial Schrödinger ro-vibrational equation, and then the molecular parameters are obtained by fitting. Our results for X³Σ^- agree well with those in the references. We compute the electronic dipole moments (EDMs) of these states with different bound lengths, and analyze the relationship between the electronic configurations and EDMs. The electronic transition dipole moment matrix elements, Franck-Condon factors and oscillator strengths f₀₀ of A³Π-X³Σ^- are evaluated, and radiative lifetimes of five lowest vibrational levels of A³Π state are derived. Finally the predissociation mechanism of A³Π state is discussed in detail, and the dissociation lifetimes of high vibrational levels are obtained.