We present converged quantum mechanical scattering calculations of reaction and quenching probabilities for a problem involving an electronically excited product. The calculations correspond to two coupled potential energy surfaces representing the ground and first electronically excited state of H2Br. Results are presented for H + HBr → H2 + Br and H + Br → H2 + Br*, where an asterisk denotes electronic excitation, and the lack of an asterisk denotes the electronic ground state. The calculations are carried out by linear algebraic variational methods with a multi-arrangement diabatic basis. These benchmark calculations are used to test a one-dimensional model, which is found to be quantitatively unreliable.
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This work was supportedin part by the National Science Foundation,t he Army Research Office
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