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Reactive cross-sections for the collision of open shell S(^1D) atoms withortho- and para-hydrogen, in the kinetic energy range 1-120 K, have beencalculated using the hyperspherical quantum reactive scattering methoddeveloped by Launay et al. [Chem. Phys. Lett. 169, 473 (1990)]. Short-rangeinteractions, described using the {\em ab initio} potential energy surface byHo et al. were complemented with an accurate description of the long-rangeinteractions, where the main electrostatic (~R^{-5}) and dispersion (~ R^{-6})contributions were considered. This allows the comparison with recentexperimental measurements of rate constants and excitation functions for thetitle reaction at low temperatures [Berteloite et al., Phys. Rev. Lett., 2010].The agreement is fairly good. The behavior in the considered energy range canbe understood on the average in terms of a classical Langevin (capture) model,where the centrifugal barriers determine the amount of reactive flux whichreaches the barrierless transition state. Additionally, the structure of thevan der Waals well provides temporal trapping at short distances thus allowingthe system to find its way to the reaction at some classically-forbiddenenergies. Interestingly, the cross-section for para-hydrogen shows clearlyoscillating features associated to the opening of new partial waves and toshape resonances which may be amenable to experimental detection.

Reaching the cold regime: S(^1D) + H_2 and the Role of Long-Range Interactions in Open Shell Reactive Collisions