Accurate time-dependent quantum scattering calculation for diatom-diatom reaction with branching: HD + OH → H + DOH, D + HOH

We report calculation of reaction probabilities and branching ratios for the four-atom reaction HD + OH → H + DOH, D + OH2 on the modified Schatz-Elgersma potential energy surface using the time-dependent approach developed previously for studying H2 + OH reaction. The branching ratio PDOHP HOH is smaller than the one at low collision energies where hydrogen tunneling is dominant, but is greater than the one at high collision energies. The explanation for the isotope branching ratio is furnished.