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Phys Rev Lett. 2010 Nov 12;105(20):203201. Epub 2010 Nov 10.

Kinetics and dynamics of the S(1D2) + H2 → SH + H reaction at very low temperatures and collision energies.

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1
Institut de Physique de Rennes, UMR 6251 du CNRS-Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France.

Abstract

We report combined studies on the prototypical S(1D2) + 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.

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