Charge transfer in collisions of atomic hydrogen with N7+ ions in the high-energy region.

A method to calculate electron-capture cross sections for collisions between an arbitrary n/sub i/l/sub i/m/sub i/ shell of a hydrogenic target and an arbitrary n/sub f/l/sub f/m/sub f/ shell of a fast bare projectile has been developed in the framework of the continuum distorted-wave approximation. Analytical expressions are derived for the Coulomb integrals in closed form in terms of Gauss hypergeometric functions in a terminating series. As an application, the cross sections in N/sup 7+/+H(1s) collisions are calculated in the energy range between 10 and 40 MeV and compared with existing theoretical calculations. The total charge-transfer cross sections have been evaluated by applying an n/sup -3/ law for n greater than or equal to 7 levels.