  The paper presents the algorithm of a code written for computing the cross
section for a charge transfer process involving a neutral molecule and a
monatomic ion. The entrance and exit potential energy surfaces, driving the
collision dynamics, are computed employing the Improved Lennard-Jones function
that accounts for the role of non-electrostatic forces, due to size repulsion
plus dispersion and induction attraction. In addition, electrostatic
components, affecting the entrance channels, are evaluated as sum of Coulomb
contributions, determined by the He$^+$ ion interacting with the charge
distribution on the molecular frame. The cross section is estimated by
employing the Landau-Zener-St\"uckelberg approach. The code implemented has
been employed in systems involving helium cation and a small organic molecule,
such as methanol, dimethyl ether and methyl formate.
