[en] Ab initio CI adiabatic potentials and dipole moment matrix elements for the triatomic dication NH₂²⁺ in the collinear, asymmetric arrangement have been calculated. A diabatic description of the collision process is obtained by a unitary transformation in a representation that diagonalizes the dipole moment matrix. Neglecting H₂ orientation and rotation, cross sections for the charge transfer process N²⁺ + H₂(v=0) → N⁺ + H₂⁺(v') are determined with a close-coupled quantal method. Results will be compared to recent measurements