THE S--H-2 COLLISION SYSTEM REVISITED

It was found that the experimental results on the S--H-2 collisional s ystem previously published were affected at low collision energy by an experimental artefact. The correction primarily concerns the shape of the angular distributions of the three competing channels: simple det achment, reactive detachment and reactive charge transfer. The main co nclusion of the previous paper stays unaffected, namely that, as for h alide-H-2 systems, the trajectories leading at low collision energy to these three channels have a common path in the reactive SH-H- ''valle y'' after an adiabatic passage through the crossing seam between the t wo S-HH and SHH- surfaces (diabatic with regard to the active electron ). This conclusion is now reinforced in the light of the newly measure d angular distributions obtained for the three channels. Their evoluti on with collision energy implies the existence of a unique short lived SH2- species explored by three types of trajectories leading to R, RD and SD channels. The role of the intermediate complex (SHH)(-) is inv estigated using a combination of the symmetric top model and the oscil lating complex model.