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The atomic hydrogen formation channels of the C + C2H2 reaction have beeninvestigated using a continuous supersonic flow reactor over the 52 K 296 Ktemperature range. H-atoms were detected directly at 121.567 nm by vacuumultraviolet laser induced fluorescence. Absolute H-atom yields were determinedby comparison with the H-atom signal generated by the C + C2H4 reaction. Theproduct yields agree with earlier crossed beam experiments employing universaldetection methods. Incorporating these branching ratios in a gas-grain model ofdense interstellar clouds increases the cC3H abundance. This reaction is aminor source of C3 containing molecules in the present simulations.

Temperature Dependent Product Yields for the Spin Forbidden Singlet Channel of the C(3P) + C2H2 Reaction