The role of van der Waals interaction in O($^{3}$P)+H$_{2}$ reaction at low temperatures*

We report quantum scattering calculations of the O($^3P$)+H$_2(v)$ reaction with an aim of determining sensitivity of the results to details of the interaction potential. We use two different analytic representations of the $^3A''$ potential energy surface (PES)\ -\ the GLDP surface reported by Rogers et al. (J. Phys. Chem. A {\bf 104}, 2308 (2000)) that provides a partial description of the van der Waals region and the more recent BMS1 and BMS2 PESs by Brand\~ao et al. (J. Chem. Phys {\bf 121}, 8861 (2004)) which explicitly include the van der Waals part. The ab initio data of Rogers et al. form the basis of all three surfaces. We report cross sections and rate coefficients on the three PESs using accurate quantum calculations. We also perform quasiclassical trajectory calculations on all three surfaces to explore quantum effects at low temperatures.