CHARGE-TRANSFER IN COLLISION OF N2+ AND HE

Charge transfer cross-sections in the collision of a doubly-charged ni trogen ion and a helium atom are evaluated with a close-coupling forma lism. The charge transfer produces N+(P-3), N+(D-1) and He+ ions via t he (2) Sigma(+) and (2) Pi molecular states of NHe2+. We describe a me thod for obtaining a particular diabatic representation from a set of adiabatic dipole moments. Comparison with Landau-Zener model calculati ons is made and the importance of inner couplings for the production o f charge transfer states is demonstrated. Collisional rate coefficient s are also obtained. At 10(4) K, the rate coefficient for charge trans fer into the ground N+(P-3) state is about 1.3 x 10(-10) cm(3) s(-1) a nd for charge transfer into the metastable N+(D-1) state 1.8 x 10(-11) cm(3) s(-1).