Department of Chemistry, Indian Institute of Technology, Kanpur-208 016 We review some of our classical mechanical and quantum mechanical investigations of the reaction, He+ \(He_{2}^{+}\)+ HeH+ + H and its isotopic analog He + HD+ → HeH++D. HeD++H as well as the dissociative channel He+\(He_{2}^{+}\)→He+H+H+ over a wide range of translational energies for different vibrational states of \(He_{2}^{+}\)(HD+) while at the same time relating them to experimental and theoretical studies from other laboratories.