How Measurements of Rate Coefficients at Low Temperature Increase the Predictivity of Photochemical Models of Titan’s Atmosphere

The predictivity of photochemical models of Titan’s atmosphere depends strongly on the precision and accuracy of reaction rates. For many reactions, large uncertainty results from the extrapolation of rate laws to low temperatures. A few reactions have been measured directly at temperatures relevant...

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Published inThe journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Vol. 113; no. 42; pp. 11227 - 11237
Main Authors Hébrard, E, Dobrijevic, M, Pernot, P, Carrasco, N, Bergeat, A, Hickson, K. M, Canosa, A, Le Picard, S. D, Sims, I. R
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 22.10.2009
Subjects
Astrophysics
Earth and Planetary Astrophysics
Physics
Sciences of the Universe
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Summary:The predictivity of photochemical models of Titan’s atmosphere depends strongly on the precision and accuracy of reaction rates. For many reactions, large uncertainty results from the extrapolation of rate laws to low temperatures. A few reactions have been measured directly at temperatures relevant to Titan’s atmosphere. In the present study, we observed the consequences of the reduced uncertainty attributed to these reactions. The global predictivity of the model was improved, i.e., most species are predicted with lower uncertainty factors. Nevertheless, high uncertainty factors are still observed, and a new list of key reactions has been established.
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ISSN:1089-5639
1520-5215
DOI:10.1021/jp905524e