Abstract: Charge transfer cross sections in C^q+ +H, N^q+ + HO ^q+ + H collisions are calculated with the CTMC method. The energy range of incident projectile is from 10keV/amu to 250keV/amu. The ions are partially stripped o rfully. Hamilton's equations of motion are given by the 12 coupled equations. Six pseudo-random parameters are required for the determination of the trajectories. A model potential between A^q+ ion and the active electron is used. The other two interactions are pure Coulombic. In our calculation, more than 2000 trajectories are required. Introducing reduced variables, σ_tr=σ_tr/q, E=E/q^1/2, a q-scaled electron capture cross section curve is obtained, all cross section data are grouped around a single curve. Numerical results are compared with other theoretical calculations. It shows that the resuts are in reasonable agreement with other Ones.

Key words: charge transfer, ionization, cross sections, Monte Carlomethod, classical trajectory