Other
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996icar..122..233r&link_type=abstract
Icarus, Volume 122, Issue 2, pp. 233-241.
Other
37
Scientific paper
Recently the rate constants of the reactions C_2H_3 + H_2 --> C_2H_4 + H and C_2H_3 + H --> products have been measured by more direct methods than used previously. The new determination for the rate constant of C_2H_3 + H_2 is lower by a factor of 1000 at room temperature than the rate used by Allen et al. in their methane photochemical model (The relative abundance of ethane to acetylene in the jovian stratosphere, Icarus 100, 527-533 (1992)). A fast rate for this reaction is key to their proposed reaction scheme to convert C_2H_2 to C_2H_6 and explain the C_2H_6/C_2H_2 ratio on Jupiter. However, their scheme becomes ineffective when a rate constant expression consistent with Fahr et al. is used (Experimental determination of the rate constant for the reaction of C_2H_3 with H_2 and implications for the partitioning of hydrogen in the atmospheres of the other planets, Icarus 116, 415-422 (1995)). The rate measurement for C_2H_3 + H by Monks et al. (Kinetics and products of the reaction between H and C_2H_2 of T = 213 and 298 K, J. Phys. Chem. 99, 17,151-17,159 (1993)) is consistent with recent measurements but they found C_2H_4 to be a significant product, in addition to C_2H_2 + H_2. Only the latter product channel had been used in methane photochemical models. With the new lower rate constant for C_2H_3 + H_2, the reaction C_2H_3 + H --> C_2H_4 becomes important in determining the C_2H_6/C_2H_2 ratio on Jupiter. However, the new reaction scenario is less efficient in converting C_2H_2 to C_2H_6 than the one proposed by Allen et al. because it depends in part upon H, which is in scarce supply in the lower stratosphere where C_2H_3 + H --> C_2H_4 is important.
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