Argand diagram representation of orbiting resonance in proton-transfer collision

Dynamic resonance in atom-diatomic molecule collisions has been relatively well studied compared to orbiting resonance. We discuss orbiting resonance on reactive scattering involving proton (charge) transfer. Resonance structure is predicted to exist at forward-scattering angles in both the state-to-state angular distribution and the Argand diagram for the proton-transfer collision system of He+H{sub 2}{sup +}{r arrow}HeH{sup +}+H. The present study demonstrates the possibility of orbiting resonance particularly in proton (charge) -transfer reaction involving atom-diatomic molecule systems.