Evaluated kinetic and photochemical data for atmospheric chemistry, organic species: Supplement VII

This paper updates and extends part of the previous data base of critical e valuations of the kinetics and photochemistry of gas-phase chemical reactio ns of neutral species involved in atmospheric chemistry [J, Phys, Chem. Ref . Data 9, 295 (1980); 11, 327 (1982); 13, 1259 (1984); 1.8, 881 (1989); 21, 1125 (1992); 26, 521 (1997); 26, 1329 (1997)], The present evaluation is l imited to the organic family of atmospherically important reactions. The wo rk has been carried out by the authors under the auspices of the IUPAC Subc ommittee on Gas Phase Kinetic Data Evaluation for Atmospheric Chemistry. Da ta sheets have been prepared for 171 thermal and photochemical reactions, c ontaining summaries of the available experimental data with notes giving de tails of the experimental procedures. For each thermal reaction, a preferre d value of the rate coefficient at 298 K is given together with a temperatu re dependence where possible. The selection of the preferred value is discu ssed and estimates of the accuracies of the rate coefficients and temperatu re coefficients have been made for each reaction. For each photochemical re action the data sheets list the preferred values of the photoabsorption cro ss sections and the quantum yields of the photochemical reactions together with comments on how they were selected. The data sheets are intended to pr ovide the basic physical chemical data needed as input for calculations whi ch model atmospheric chemistry. A table summarizing the preferred rate data is provided, together with an Appendix listing the available values of ent halpies of formation of the reactant and product species. (C) 1999 American Institute of Physics and American Chemical Society. [S0047-2689(94)00102-6 ].