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Absolute and relative rate constants for the reactions CH3C(O)O2 + NO and CH3C(O)O2 + NO2 and thermal stability of CH3C(O)O2NO2

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

  • Jens Sehested
  • Lene Krogh Christensen
  • Trine Møgelberg
  • Nielsen, Ole John
  • Timothy J. Wallington
  • Andrei Guschin
  • John J. Orlando
  • Geoffrey S. Tyndall

A pulse-radiolysis system was used to measure absolute rate constants for the reactions of CH3C(O)O2 radicals with NO and NO2 at 295 K and 1000 mbar total pressure of SF6. When the rate of formation and decay of NO2 using its absorption at 400.5 and 452 nm were monitored, the rate constants k(CH3C(O)O2 + NO) = (2.0 ± 0.3) × 10-11 and k(CH3C(O)O2 + NO2) = (1.0 ± 0.2) × 10-11 cm3 molecule-1 s-1 were determined. Long path-length Fourier transform infrared spectrometers were used to study the rate-constant ratio k(CH3C-(O)O2 + NO)/k(CH3C(O)O2 + NO2) in 6-700 Torr total pressure of N2 diluent at 243-295 K. At 295 K in 700 Torr of N2 diluent k(CH3C(O)O2 + NO)/k(CH3C(O)O2 + NO2) = 2.07 ± 0.21. The results are discussed in the context of the atmospheric chemistry of acetylperoxy radicals.

OriginalsprogEngelsk
TidsskriftJournal of Physical Chemistry A
Vol/bind102
Udgave nummer10
Sider (fra-til)1779-1789
Antal sider11
ISSN1089-5639
StatusUdgivet - 5 mar. 1998

ID: 225753859