Experimental and Theoretical Study of the Atmospheric Chemistry and Global Warming Potential of SO2F2
- 17 November 2008
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry A
- Vol. 112 (49), 12657-12666
- https://doi.org/10.1021/jp806368u
Abstract
In this work, potential atmospheric loss processes for SO2F2, a commercially used biocide (fumigant), have been studied and its global warming potential calculated. Rate coefficients for the gas-phase reactions OH + SO2F2 → products, k1, and Cl + SO2F2 → products, k4, were determined using a relative rate technique to be k1 < 1 × 10−16 cm3 molecule−1 s−1 at 296 and 333 K and k4(296 K) < 5 × 10−17 cm3 molecule−1 s−1. UV absorption cross sections of SO2F2 were measured at 184.9, 193, and 213.9 nm, and its photolysis quantum yield at 193 nm was determined to be 300, >10 000, 700, and >4700 years, respectively. The stratospheric lifetime of SO2F2 is calculated using a two-dimensional model to be 630 years. The global warming potential (GWP) for SO2F2 was calculated to be 4780 for the 100 year time horizon using infrared absorption cross sections measured in this work and a SO2F2 globally averaged atmospheric lifetime of 36 years, which is determined primarily by ocean uptake, reported by Mühle et al. (Mühle, J.; Huang, J.; Weiss, R. F.; Prinn, R. G.; Miller, B. R.; Salameh, P. K.; Harth, C. M.; Fraser, P. J.; Porter, L. W.; Greally, B. R.; O’Doherty, S.; Simonds, P. G. J. Geophys. Res., submitted for publication, 2008). Reaction channels and the possible formation of stable adducts in reactions 1 and 4 were evaluated using ab initio, CCSD(T), and density functional theory, B3P86, quantum mechanical electronic structure calculations. The most likely reaction product channels were found to be highly endothermic, consistent with the upper limits of the rate coefficients measured in this work.Keywords
This publication has 18 references indexed in Scilit:
- Bond Dissociation Energies in Second-Row CompoundsThe Journal of Physical Chemistry A, 2008
- The atmospheric chemistry of sulphuryl fluoride, SO2F2Atmospheric Chemistry and Physics, 2008
- The HSO−SOH Isomers Revisited: The Effect of Tight d FunctionsThe Journal of Physical Chemistry A, 2004
- Thermochemical Properties for Small Halogenated Molecules Calculated by the Infinite Basis Extrapolation MethodThe Journal of Physical Chemistry A, 2002
- Gaussian basis sets for use in correlated molecular calculations. X. The atoms aluminum through argon revisitedThe Journal of Chemical Physics, 2001
- Infinite basis limits in electronic structure theoryThe Journal of Chemical Physics, 1999
- Basis-set extrapolationChemical Physics Letters, 1998
- Photochemistry of acetone under tropospheric conditionsChemical Physics, 1998
- Rate Constants and Temperature Dependences for the Reactions of Hydroxyl Radical with Several Halogenated Methanes, Ethanes, and Propanes by Relative Rate MeasurementsThe Journal of Physical Chemistry, 1995
- Atmospheric fate of difluoromethane, 1,1,1-trifloroethane, pentafluoroethane, and 1,1-dichloro-1-fluoroethane: rate coefficients for reactions with hydroxyl and UV absorption cross sections of 1,1-dichloro-1-fluoroethaneThe Journal of Physical Chemistry, 1991