  We study the spin-dependent stereodynamics of the S + H2 -> SH + H reaction
using full-dimensional quantum dynamics calculations with zero total nuclear
angular momentum along the triplet 3A" states and singlet 1A' states. We find
that the interplay between the electronic spin direction and the molecular
geometry has a measurable influence on the singlet-triplet intersystem crossing
reaction probabilities. Our results show that for some incident scattering
angles in the body-fixed frame, the relative difference in intersystem crossing
reaction probabilities (as determined between spin up and spin down initial
states) can be as large as 15%. Our findings are an ab initio demonstration of
spin-dependent nonadiabatic dynamics which we hope will shine light as far as
understanding the chiral-induced spin selectivity effect.
