title: Atmospheric chemistry of Z- and E-CF3CH[double bond, length as m-dash]CHCF3.
abstract: The atmospheric fates of Z- and E-CF3CH[double bond, length as m-dash]CHCF3have been studied, investigating the kinetics and the products of the reactions of the two compounds with Cl atoms, OH radicals, OD radicals, and O3. FTIR smog chamber experiments measured: k(Cl + Z-CF3CH[double bond, length as m-dash]CHCF3) = (2.59 ± 0.47) × 10-11, k(Cl + E-CF3CH[double bond, length as m-dash]CHCF3) = (1.36 ± 0.27) × 10-11, k(OH + Z-CF3CH[double bond, length as m-dash]CHCF3) = (4.21 ± 0.62) × 10-13, k(OH + E-CF3CH[double bond, length as m-dash]CHCF3) = (1.72 ± 0.42) × 10-13, k(OD + Z-CF3CH[double bond, length as m-dash]CHCF3) = (6.94 ± 1.25) × 10-13, k(OD + E-CF3CH[double bond, length as m-dash]CHCF3) = (5.61 ± 0.98) × 10-13, k(O3+ Z-CF3CH[double bond, length as m-dash]CHCF3) = (6.25 ± 0.70) × 10-22, and k(O3+ E-CF3CH[double bond, length as m-dash]CHCF3) = (4.14 ± 0.42) × 10-22cm3molecule-1s-1in 700 Torr of air/N2/O2diluents at 296 ± 2 K. E-CF3CH[double bond, length as m-dash]CHCF3reacts with Cl atoms to give CF3CHClC(O)CF3in a yield indistinguishable from 100%. Z-CF3CH[double bond, length as m-dash]CHCF3reacts with Cl atoms to give (95 ± 10)% CF3CHClC(O)CF3and (7 ± 1)% E-CF3CH[double bond, length as m-dash]CHCF3. CF3CHClC(O)CF3reacts with Cl atoms to give the secondary product CF3C(O)Cl in a yield indistinguishable from 100%, with the observed co-products C(O)F2and CF3O3CF3. The main atmospheric fate for Z- and E-CF3CH[double bond, length as m-dash]CHCF3is reaction with OH radicals. The atmospheric lifetimes of Z- and E-CF3CH[double bond, length as m-dash]CHCF3are estimated as 27 and 67 days, respectively. IR absorption cross sections are reported and the global warming potentials (GWPs) of Z- and E-CF3CH[double bond, length as m-dash]CHCF3for the 100 year time horizon are calculated to be GWP100= 2 and 7, respectively. This study provides a comprehensive description of the atmospheric fate and impact of Z- and E-CF3CH[double bond, length as m-dash]CHCF3.
authors.affiliation: Department of Chemistry, Copenhagen Center for Atmospheric Research, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark. freja.oesterstroem@gmail.com.
authors.forename: Freja F
authors.identifier: http://orcid.org/0000-0003-4125-3365
authors.initials: FF
authors.lastname: Østerstrøm
authors.affiliation: Department of Chemistry, Copenhagen Center for Atmospheric Research, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark. freja.oesterstroem@gmail.com.
authors.forename: Simone Thirstrup
authors.initials: ST
authors.lastname: Andersen
authors.affiliation: Department of Chemistry, Copenhagen Center for Atmospheric Research, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark. freja.oesterstroem@gmail.com.
authors.forename: Theis I
authors.initials: TI
authors.lastname: Sølling
authors.affiliation: Department of Chemistry, Copenhagen Center for Atmospheric Research, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark. freja.oesterstroem@gmail.com.
authors.forename: Ole John
authors.initials: OJ
authors.lastname: Nielsen
authors.affiliation: Department of Chemistry, Copenhagen Center for Atmospheric Research, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark. freja.oesterstroem@gmail.com and Department of Chemistry and Biochemistry, California State University Northridge, 18111 Nordhoff St., Northridge, CA 91330-8262, USA. mpsa@csun.edu.
authors.forename: Mads P
authors.initials: MP
authors.lastname: Sulbaek Andersen