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Dissociative Recombination of D3S+: Product Branching Fractions and Absolute Cross Sections

The dissociative recombination (DR) of D3S+ has been studied at the heavy ion storage ring CRYRING. The absolute DR cross sections have been measured over the interaction energy range between ~0 and 0.1 eV, and the energy-dependent cross section obtained is best fitted by the expression σ (E) = (1.3 ± 0.3) × 10−16E−1.36 ± 0.04 cm2. From the cross section the thermal rate coefficient has been deduced to be (2.8 ± 0.7) × 10−7(T/300)−0.86 ± 0.03 cm3 s−1. The branching fractions in the reaction have been measured at ~0 eV collision energy. The break-up into D2S+D occurs with a probability of only 0.17 ± 0.08, whereas the three-body channel DS+2D dominates with a probability of 0.58 ± 0.11. The remaining channels DS+D2 and S+D2+D contribute with 0.15 ± 0.07 and 0.10 ± 0.06, respectively. The impact of these results on the sulfur chemistry and deuterium fractionation in dark molecular clouds was investigated through chemical kinetic models. With these data, the calculated fractional abundance of H2S is lower than observed in TMC-1, which supports the assertion that H2S is formed on grain surfaces and not through gas-phase reactions.