The infinite-order-sudden method for light–heavy–light reactions: Application to D+HCl→DCl+H

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An infinite-order-sudden (IOS) theory for light-heavy-light reactions is applied to the D+HCl(v = 0, j)→DCl(v′?1, j′)+H reaction. The results are compared with those obtained using a more accurate quantum-dynamical technique, the ESA–CSA method, in which the energy sudden approximation is used for the entrance channel, while the centrifugal sudden approximation is employed for the exit channel. The computations have been performed using LEPS and DIM potential energy surfaces. We obtain good agreement between the IOS and ESA–CSA results, not only for averaged quantities such as rate coefficients, but also for detailed vibrational-rotational reactive cross sections.