Role of Potential Curve Crossing in Subexcitation Molecular Collisions: Exact (Two-State) Computations vs Decoupling Approximations for Resonance Positions

Abstract

Exact numerical solutions for two‐state curve‐crossing problems in the subexcitation region are presented and discussed in terms of various decoupling schemes. These provide an approximate, single‐channel description of the problem. The energies of the bound states in the (decoupled) closed channel are used as approximations for the resonance positions. The transition from a weak to a strong coupling regime is discussed and a treatment of the resonances in the intermediate coupling region using a diabatic basis is provided.