Novel model potential treatment of charge transfer cross sections in C4+ and N5+ collisions with H2

We present cross sections for electron capture in C(4+), N(5+) + H(2) collisions in the energy range 50 eV/amu less than or equal to E less than or equal to 6 keV/amu, calculated using a model potential approximation to treat the interaction of the active electron with the cores. To avoid the difficulties of the standard independent particle model at low velocity, we have applied a modified technique where the independent particle model is used to evaluate the matrix elements of the two-electron Hamiltonian.