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

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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.