Quantum reaction dynamics of an asymmetric exoergic heavy-light-heavy system: Cl+HBr -> HCl+Br

Quantum dynamics calculations for HBr + Cl --> Br + HCl are carried out usi ng the hyperspherical elliptic coordinates. The concepts of potential ridge and nonadiabatic transitions at avoided crossings introduced previously fo r isoergic and symmetric three-dimensional heavy-light-heavy reactions are confirmed to be useful to clarify the mechanisms of vibrationally nonadiaba tic reactions in this exo-(or endo-)ergic system. The role of important avo ided crossings which dominate the reaction dynamics is illustrated.