Abstract This paper utilizes multireference configuration interaction theory to calculate the lifetime of A2 state for nitrogen molecular ion N. It obtains the transition moment function for A2 X2, 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 = 0, 1, 2, 3, 4, 5 vibrational levels of A2state, respectively, which are in excellent agreement with available experimental values.
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