The UK molecular R-matrix codes are used to study electron collisions with the molecular ion. Full configuration interaction calculations are performed to obtain the potential energy curves of the ground X and the first excited A electronic states of . Resonances, effective quantum numbers, and resonance widths as a function of the internuclear separation are determined for the lowest singlet and and triplet and states, which are relevant for the study of the reactive collision of with low-energy electrons. In addition, bound states are also calculated for each symmetry of at several geometries.
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