Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 6 2008 10.5194/acp-8-1547-2008 http://www.atmos-chem-phys.net/8/1547/2008/ http://www.atmos-chem-phys.net/8/1547/2008/acp-8-1547-2008.html http://www.atmos-chem-phys.net/8/1547/2008/acp-8-1547-2008.pdf 1547 1557 2008-03-13 The atmospheric chemistry of sulphuryl fluoride, SO2F2 T. J. Dillon dillon@mpch-mainz.mpg.de A. Horowitz J. N. Crowley Max Planck Institute for Chemistry, Mainz, Germany The atmospheric chemistry of sulphuryl fluoride, SO2F2, was investigated in a series of laboratory studies. A competitive rate method, using pulsed laser photolysis (PLP) to generate O(1D) coupled to detection of OH by laser induced fluorescence (LIF), was used to determine the overall rate coefficient for the reaction O(1D) + SO2F2 → products (R1) of k1 (220–300 K) = (1.3 ± 0.2) × 10−10 cm3 molecule−1 s−1. Monitoring the O(3P) product (R1a) enabled the contribution (α) of the physical quenching process (in which SO2F2 is not consumed) to be determined as α (225–296 K)=(0.55 ± 0.04). Separate, relative rate measurements at 298 K provided a rate coefficient for reactive loss of O(1D), k1b, of (5.8 ± 0.8) × 10−11 cm3 molecule−1 s−1 in good agreement with the value calculated from (1−α) × k1=(5.9 ± 1.0) × 10−11 cm3 molecule−1 s−1. Upper limits for the rate coefficients for reaction of SO2F2 with OH (R2, using PLP-LIF), and with O3 (R3, static reactor) were determined as k2 (294 K)<1 × 10−15 cm3 molecule−1 s−1 and k3 (294 K)<1 × 10−23 cm3 molecule−1 s−1. In experiments using the wetted-wall flow tube technique, no loss of SO2F2 onto aqueous surfaces was observed, allowing an upper limit for the uptake coefficient of γ(pH 2–12)<1 × 10−7 to be determined. These results indicate that SO2F2 has no significant loss processes in the troposphere, and a very long stratospheric lifetime. Integrated band intensities for SO2F2 infrared absorption features between 6 and 19 μm were obtained, and indicate a significant global warming potential for this molecule. In the course of this work, ambient temperature rate coefficients for the reactions O(1D) with several important atmospheric species were determined. The results (in units of 10−10 cm3 molecule−1 s−1, k(O1D + N2)=(0.33 ± 0.06); k(O1D + N2O)=(1.47 ± 0.2) and k(O1D + H2O)=(1.94 ± 0.5) were in good agreement with other recent determinations. Atkinson, R., Baulch, D. L., Cox, R. A., Crowley, J. N., Hampson, R. F., Hynes, R. G., Jenkin, M. E., Kerr, J. A., Rossi, M. J., and Troe, J.: IUPAC Subcommittee for gas kinetic data evaluation, evaluated kinetic data: http://www.iupac-kinetic.ch.cam.ac.uk/, 2007. Blitz, M. A., Dillon, T. J., Heard, D. E., Pilling, M. J., and Trought, I. D.: Laser induced fluorescence studies of the reactions of O($^1$D$_2)$ with N2, O2, N2O, CH4, H2, CO2, Ar, Kr and n-C4H$_10$, Phys. Chem. Chem. 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