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The formation of C3H4(Propyne and Allene), C4H2(Butadiyne) and also of formaldehyde in the system C2H2/O with and without added H atoms was studied at 298 K and in a pressure range between 1.4 and 8.0 mbar. H atoms have a strongly positive influence on the rates of formation of these species. The results obtained for largely varying initial conditions were described quantitatively by a reaction mechanism of 25 reactions. Experiments with D atoms and with different O2concentrations gave additional evidence of the radical reactions involved.
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Homann et al. (1981) studied this question.
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