Electronic non-adiabatic transitions in the reaction Ar++H2(vi =0)→ArH++H

In this study is presented a two-state model which is applied to the collinear Ar++H2(vi =0)→ArH++H reaction. The model is based on the assumption that the reaction, for translational energies Ek ⩾ 0.06 eV, is mainly governed by a crossing of the grouped vibrational state of the Ar++H2 system with the second excited state of the Ar+H2 + system. The results were compared with those obtained by exact collinear quantum-mechanical calculations (M. Baer and A. J. Beswick, Chem. Phys. Lett., 1977, 51, 360) and were found to fit them rather well.

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