3 D quantum scattering calculations of the reaction He + H , + +

An improved version of the S-matrix Kohn variational method has been applied to calculating 3D quantum reaction probabilities of the ion-molecular reaction He+ HT (u) AHeH+ + H. The calculation is carried out for total angular momentum J= 0 and employs the DIM potential surface of Kuntz. Our results show that vibrational excitation of H: enhances the reaction probabilities and are in qualitative agreement with early experimental results. The calculated reaction probabilities are found to be highly oscillatory as a function of scattering energy and are associated with resonances of the system.