Open and closed channel resonances in the collinear inelastic scattering of He by H+2

Collinear quantum mechanical calculations are reported for the inelastic scattering of He by H+2 at energies below the reaction threshold. The inelastic transition probability curves show pronounced quantum oscillations as a function of energy due to both open and closed channel resonances. An analysis of these resonances indicates that the open channel resonance is associated with tunneling through a small barrier and the closed channel resonance is a Feshbach or compound state resonance corresponding to vibrational excitation of H+2 to a closed vibrational state. The compound state resonances are similar to those found earlier to be important in the reaction He+H+2→HeH++H.