State-selective charge transfer in slow collisions of partially stripped He-like ions with H-2

State-selective charge transfer from H-2 by C4+ and N5+ in the low-energy r egion (0.01 less than or equal to E less than or equal to 2 keV amu(-1)) ha s been investigated employing the semiclassical, impact parameter, close-co upling method based on a molecular expansion augmented with the plane-wave translation factor. Freezing the molecular features of the target, the coll iding system is approximated by a pseudo-one-electron entity. The method of pseudopotential is applied to account for the binding of the electron in t he transient diatomic quasimolecule. A large number of close-coupled equati ons are solved to obtain probabilities of transitions, and thereby evaluate the partial capture cross sections. Both the total and partial capture cro ss sections agree well with the recent experimental results. The low-energy behavior of the total cross sections due to C4+ and N5+ is very different owing to their different core structure, albeit both are He-like ions; the former shows some fluctuations whereas the latter registers a monotonic ris e with E. The possible role of the projectile core size on the final I dist ribution of the estimated cross section is discussed. The inclusion of the rotational couplings is essential for the correct low-energy behavior of th e cross sections. For N5+ + H-2, the low-energy I distribution of the captu re cross sections has been presented. [S1050-2947(99)05802-3].