EVALUATED KINETIC, PHOTOCHEMICAL AND HETEROGENEOUS DATA FOR ATMOSPHERIC CHEMISTRY .5. IUPAC SUBCOMMITTEE ON GAS KINETIC DATA EVALUATION FORATMOSPHERIC CHEMISTRY

This paper updates and extends previous critical evaluations of the ki netics and photochemistry of gas-phase chemical reactions of neutral s pecies involved in atmospheric chemistry [J. Phys. Chem. Ref. Data 9, 295 (1980); 11, 327 (1982); 13, 1259 (1984); 18, 881 (1989); 21, 1125 (1992)]. The work has been carried out by the authors under the auspic es of the IUPAC Subcommittee on Gas Phase Kinetic Data Evaluation for Atmospheric Chemistry. Data sheets have been prepared for 658 thermal and photochemical reactions, containing summaries of the available exp erimental data with notes giving details of the experimental procedure s. For each reaction, a preferred value of the rate coefficient at 298 K is given together with a temperature dependence where possible. The selection of the preferred value is discussed and estimates of the ac curacies of the rate coefficients and temperature coefficients have be en made for each reaction. The data sheets are intended to provide the basic physical chemical data needed as input for calculations which m odel atmospheric chemistry. A table summarizing the preferred rate dat a is provided, together with an appendix listing the available data on enthalpies of formation of the reactant and product species. We have also included for the first time in this series of evaluations a secti on on heterogeneous reactions of importance in atmospheric chemistry. (C) 1997 American Institute of Physics and American Chemical Society.