Kinetics and Dynamics of the S(^1D_2) + H_2 \to SH + H Reaction at Very Low Temperatures and Collision Energies

We report combined studies on the prototypical S(^1D_2) + H2 insertion reaction. Kinetics and crossed-beam experiments are performed in experimental conditions approaching the cold energy regime, yielding absolute rate coefficients down to 5.8 K and relative integral cross sections to collision energies as low as 0.68 meV. They are supported by quantum calculations on a potential energy surface treating long range interactions accurately. All results are consistent and the excitation function behavior is explained in terms of the cumulative contribution of various partial waves.

Coralie Berteloite, Manuel Lara, Astrid Bergeat, Sébastien Le Picard, Fabrice Dayou, Kevin M. Hickson, André Canosa, Christian Naulin, Jean-Michel Launay, Ian R. Sims, Michel Costes · 2010