THE 2P-SIGMA(U) (1,3)SIGMA(-)-N-2(+) COLLISIONS()(G) INTERLOPER RESONANCES IN E()

Ab initio electron scattering calculations using the R-matrix approach have been performed for N-2(+) within a three-state valence configura tion-interaction model (VCI). The lowest three electronic target state s (X (2) Sigma(u)(+), A (2) Pi(u) and the B (2) Sigma(u)(+)) of this m olecular nitrogen cation are included in the close-coupling method, wi th each state being represented by a valence CI approximation. From a detailed analysis of the resonance structure found in our work for the (1,3)Sigma(g)(+) symmetries we find four prominent Rydberg series of the type np pi(u), nf pi(u), np sigma(u), nf sigma(u) and a 2p sigma(u ) interloper resonance. This 2p sigma(u) interloper molecular resonanc e associated with the B state of N: is seen to cause distortions of th e resulting resonance spectra. A comparison of our total cross section s for the X-B transition shows excellent agreement with the available experimental data.