A BOUND-STATE CI APPROACH TO NITROGEN MOLECULAR ANIONS

We report results of nb initio MRDCI calculations on the doubler state s of different spatial symmetry of the nitrogen molecular anion. The c omputed ground-state N-2 potential as well as the lowest potential cur ve of N-2(-) were calculated over a broad range of internuclear distan ces. Several other resonant states of N-2(-) have been determined at t wo different internuclear distances by a stabilization procedure. To o ur knowledge, some of the excited-state e(-)-N-2 resonances which we f ound have not yet been reported in the literature. After applying the stabilization method with gradually increased nuclear charges to all o f the calculated anion states we conclude that, despite the appearance of many 'spurious states', the positions of the shape resonance of (2 ) Pi(g) symmetry, of three Feshbach resonances of (2) Pi(u) symmetry a nd of two of (2) Sigma(g)(+) symmetry have been identified.