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| Titel |
Rate coefficients for the reaction of formaldehyde with HO2 radicals from fluorescence spectroscopy of HOCH2OO radicals |
| VerfasserIn |
Arne Bunkan, Damien Amédro, John Crowley |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250143517
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| Publikation (Nr.) |
 EGU/EGU2017-7245.pdf |
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| Zusammenfassung |
| The reaction of formaldehyde with HO2 radicals constitutes a minor, but significant sink of
formaldehyde in the troposphere as well as a possible interference in other formaldehyde
photooxidation experiments.
HCHO + HO2 ⇌ HOCH2OO
(1)
Due to the difficulty of simultaneously monitoring the reactant and product concentrations
while preventing interfering secondary chemistry, there is a considerable uncertainty in the
literature values for the reaction rate coefficients.
We have used two photon, excited fragment spectroscopy (TPEFS), originally developed
for monitoring HNO3 formation in kinetic experiments, to monitor the formation of the
HOCH2OO radical. Dispersed and single wavelength fluorescence emission following the
193 nm photolysis of HOCH2OO have been recorded and analysed. Characterisation of the
method is presented along with rate coefficients for the reaction of HCHO with HO2 radicals
at tropospheric temperatures. |
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