Multireference calculation of lifetime of A²\Pi_u state in nitrogen-molecule cation

This paper utilizes multireference configuration interaction theory to calculate the lifetime of A²\Pi_\rm u state for nitrogen molecular ion N_2^+. It obtains the transition moment function for A²\Pi_\rm u \to X² \Sigma_\rm g^+, Franck--Condon factors between vibrational levels of the two states. The calculated lifetimes are 16.81, 14.62, 13.10, 12.18, 11.40, and 11.64 μs for v' = 0, 1, 2, 3, 4, 5 vibrational levels of A²\Pi_\rm u state, respectively, which are in excellent agreement with available experimental values.