Absolute rate constants for the self reactions of HO2, CF3CFHO2, and CF3O2 radicals and the cross reactions of HO2 with FO2, HO2 with CF3CFHO2, and HO2 with CF3O2 at 295 K

J. Sehested; T.E. Møgelberg; K. Fagerström; G. Mahmoud; T.J. Wallington

doi:10.1002/(SICI)1097-4601(1997)29:9<673::AID-KIN4>3.0.CO;2-R

Absolute rate constants for the self reactions of HO₂, CF₃CFHO₂, and CF₃O₂ radicals and the cross reactions of HO₂ with FO₂, HO₂ with CF₃CFHO₂, and HO₂ with CF₃O₂ at 295 K

J. Sehested, T.E. Møgelberg, K. Fagerström, G. Mahmoud, T.J. Wallington

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

The kinetics of the self-reactions of HO₂, CF₃CFHO₂, and CF₃O₂radicals and the cross reactions of HO₂ with FO₂, HO₂ with CF₃CFHO₂, and HO₂ with CF₃O₂ radicals, were studied by pulse radiolysis combined with time resolved UV absorption spectroscopy at 295 K. The rate constants for these reactions were obtained by computer simulation of absorption transients monitored at 220, 230, and 240 nm. The following rate constants were obtained at 295 K and 1000 mbar total pressure of SF₆ (unit: 10^-12 cm³ molecule^-1 s^-1): k(HO₂ + HO₂) = 3 5 ± 1.0, k(CF₃CFHO₂ + CF₃CFHO₂) = 3.5 ± 0.8, k(CF₃O₂ + CF₃O₂₎ = 2.25 ± 0.30, k(HO₂+ FO₂₎ = 9 ± 4, k(CF₃CFHO₂+ HO₂) = 5.0 ± 1.5, and k(CF₃O₂ + HO₂₎ = 4.0 ± 20. In addition, the decomposition rate of CF3CFHO radicals was estimated to be (0.2-2) × 10³ s^-1 in 1000 mbar of SF6. Results are discussed in the context of the atmospheric chemistry of hy-drofluorocarbons.

Original language	English
Journal	International Journal of Chemical Kinetics
Volume	29
Issue number	9
Pages (from-to)	673-682
ISSN	0538-8066
DOIs	https://doi.org/10.1002/(SICI)1097-4601(1997)29:9<673::AID-KIN4>3.0.CO;2-R
Publication status	Published - 1997

Access to Document

10.1002/(SICI)1097-4601(1997)29:9<673::AID-KIN4>3.0.CO;2-R

OpenUrl availability

Full text

Cite this

Sehested, J., Møgelberg, T. E., Fagerström, K., Mahmoud, G., & Wallington, T. J. (1997). Absolute rate constants for the self reactions of HO₂, CF₃CFHO₂, and CF₃O₂ radicals and the cross reactions of HO₂ with FO₂, HO₂ with CF₃CFHO₂, and HO₂ with CF₃O₂ at 295 K. International Journal of Chemical Kinetics, 29(9), 673-682. https://doi.org/10.1002/(SICI)1097-4601(1997)29:9<673::AID-KIN4>3.0.CO;2-R

@article{c6fa23befe114be6bcaad930f0e45a1b,

title = "Absolute rate constants for the self reactions of HO2, CF3CFHO2, and CF3O2 radicals and the cross reactions of HO2 with FO2, HO2 with CF3CFHO2, and HO2 with CF3O2 at 295 K",

abstract = "The kinetics of the self-reactions of HO2, CF3CFHO2, and CF3O2 radicals and the cross reactions of HO2 with FO2, HO2 with CF3CFHO2, and HO2 with CF3O2 radicals, were studied by pulse radiolysis combined with time resolved UV absorption spectroscopy at 295 K. The rate constants for these reactions were obtained by computer simulation of absorption transients monitored at 220, 230, and 240 nm. The following rate constants were obtained at 295 K and 1000 mbar total pressure of SF6 (unit: 10-12 cm3 molecule-1 s-1): k(HO2 + HO2) = 3 5 ± 1.0, k(CF3CFHO2 + CF3CFHO2) = 3.5 ± 0.8, k(CF3O2 + CF3O2) = 2.25 ± 0.30, k(HO2 + FO2) = 9 ± 4, k(CF3CFHO2 + HO2) = 5.0 ± 1.5, and k(CF3O2 + HO2) = 4.0 ± 20. In addition, the decomposition rate of CF3CFHO radicals was estimated to be (0.2-2) × 103 s-1 in 1000 mbar of SF6. Results are discussed in the context of the atmospheric chemistry of hy-drofluorocarbons.",

keywords = "Vindenergi og atmosf{\ae}riske processer",

author = "J. Sehested and T.E. M{\o}gelberg and K. Fagerstr{\"o}m and G. Mahmoud and T.J. Wallington",

year = "1997",

doi = "10.1002/(SICI)1097-4601(1997)29:9<673::AID-KIN4>3.0.CO;2-R",

language = "English",

volume = "29",

pages = "673--682",

journal = "International Journal of Chemical Kinetics",

issn = "0538-8066",

publisher = "JohnWiley & Sons, Inc.",

number = "9",

}

Sehested, J, Møgelberg, TE, Fagerström, K, Mahmoud, G & Wallington, TJ 1997, 'Absolute rate constants for the self reactions of HO₂, CF₃CFHO₂, and CF₃O₂ radicals and the cross reactions of HO₂ with FO₂, HO₂ with CF₃CFHO₂, and HO₂ with CF₃O₂ at 295 K', International Journal of Chemical Kinetics, vol. 29, no. 9, pp. 673-682. https://doi.org/10.1002/(SICI)1097-4601(1997)29:9<673::AID-KIN4>3.0.CO;2-R

Absolute rate constants for the self reactions of HO₂, CF₃CFHO₂, and CF₃O₂ radicals and the cross reactions of HO₂ with FO₂, HO₂ with CF₃CFHO₂, and HO₂ with CF₃O₂ at 295 K. / Sehested, J.; Møgelberg, T.E.; Fagerström, K. et al.
In: International Journal of Chemical Kinetics, Vol. 29, No. 9, 1997, p. 673-682.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

T1 - Absolute rate constants for the self reactions of HO2, CF3CFHO2, and CF3O2 radicals and the cross reactions of HO2 with FO2, HO2 with CF3CFHO2, and HO2 with CF3O2 at 295 K

AU - Sehested, J.

AU - Møgelberg, T.E.

AU - Fagerström, K.

AU - Mahmoud, G.

AU - Wallington, T.J.

PY - 1997

Y1 - 1997

N2 - The kinetics of the self-reactions of HO2, CF3CFHO2, and CF3O2 radicals and the cross reactions of HO2 with FO2, HO2 with CF3CFHO2, and HO2 with CF3O2 radicals, were studied by pulse radiolysis combined with time resolved UV absorption spectroscopy at 295 K. The rate constants for these reactions were obtained by computer simulation of absorption transients monitored at 220, 230, and 240 nm. The following rate constants were obtained at 295 K and 1000 mbar total pressure of SF6 (unit: 10-12 cm3 molecule-1 s-1): k(HO2 + HO2) = 3 5 ± 1.0, k(CF3CFHO2 + CF3CFHO2) = 3.5 ± 0.8, k(CF3O2 + CF3O2) = 2.25 ± 0.30, k(HO2 + FO2) = 9 ± 4, k(CF3CFHO2 + HO2) = 5.0 ± 1.5, and k(CF3O2 + HO2) = 4.0 ± 20. In addition, the decomposition rate of CF3CFHO radicals was estimated to be (0.2-2) × 103 s-1 in 1000 mbar of SF6. Results are discussed in the context of the atmospheric chemistry of hy-drofluorocarbons.

AB - The kinetics of the self-reactions of HO2, CF3CFHO2, and CF3O2 radicals and the cross reactions of HO2 with FO2, HO2 with CF3CFHO2, and HO2 with CF3O2 radicals, were studied by pulse radiolysis combined with time resolved UV absorption spectroscopy at 295 K. The rate constants for these reactions were obtained by computer simulation of absorption transients monitored at 220, 230, and 240 nm. The following rate constants were obtained at 295 K and 1000 mbar total pressure of SF6 (unit: 10-12 cm3 molecule-1 s-1): k(HO2 + HO2) = 3 5 ± 1.0, k(CF3CFHO2 + CF3CFHO2) = 3.5 ± 0.8, k(CF3O2 + CF3O2) = 2.25 ± 0.30, k(HO2 + FO2) = 9 ± 4, k(CF3CFHO2 + HO2) = 5.0 ± 1.5, and k(CF3O2 + HO2) = 4.0 ± 20. In addition, the decomposition rate of CF3CFHO radicals was estimated to be (0.2-2) × 103 s-1 in 1000 mbar of SF6. Results are discussed in the context of the atmospheric chemistry of hy-drofluorocarbons.

KW - Vindenergi og atmosfæriske processer

U2 - 10.1002/(SICI)1097-4601(1997)29:9<673::AID-KIN4>3.0.CO;2-R

DO - 10.1002/(SICI)1097-4601(1997)29:9<673::AID-KIN4>3.0.CO;2-R

M3 - Journal article

SN - 0538-8066

VL - 29

SP - 673

EP - 682

JO - International Journal of Chemical Kinetics

JF - International Journal of Chemical Kinetics

IS - 9