Deperturbation of the N 2+ first negative group B2Σ u+- X2Σ g+

Twelve bands of the N ₂⁺B²Σ _u⁺- X²Σ _g⁺ system, including v_B = 0-6 and v_X = 0-8, are reanalyzed. All effects of B²Σ _u⁺ ∼ A²Π _u perturbations are explicitly considered. Despite the use of high precision (0.01 cm ^-1) line measurements, no evidence for a perturber other than A²Π _u is obtained. Deperturbed constants for the B²Σ _u⁺ and X²Σ _g⁺ states are derived. The deperturbation is shown to be self-consistent and complete (excluding effects of the C²Σ _u⁺ state) by examining semiempirical relationships of the perturbation matrix elements with the spin-rotation constants of the B and X states and atomic spin-orbit parameters. A number of previous analyses of transitions involving the v_B = 3 and 5 levels are found to be incorrect.