Ab initiopotential curves for the valence states of the NH+ion

Abstract
Calculated CI potential curves for the low-lying 2Π, 4Σ-, 4Π, 2Σ+, 2Δ and 2Σ- states of NH+ are reported. Equilibrium distances, with known experimental r 0 values in parentheses, are; and r e(C2Σ+) = 1⫌159 (1⫌180). No evidence is found to support potential maxima in the curves for the X 2Π and A 2Σ- states. The 4Π, 2 4Σ- and 2 2Π states are predicted to be repulsive.