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Author(s):   Orlando, J.J.; Tyndall, G.S.
Title:   The Atmospheric Chemistry of the HC(O)CO Radical
Journal:   Int J. Chem. Kinet.
Volume:   33
Page(s):   149 - 156
Year:   2001
Reference type:   Journal article
Squib:   2001ORL/TYN149-156

Reaction:   HC(O)CO → CO + HCO
Reaction order:   1
Reference reaction:   O2 + HC(O)CO → Products
Temperature:   224 - 317 K
Pressure:  0.93 bar
Rate expression:   1.4x1012 [±5.0x1012 s-1] e-26274 [±4157 J/mole]/RT
Category:  Experiment
Data type:   Relative rate value measured
Pressure dependence:   None reported
Experimental procedure:   Static or low flow - Data taken vs time
Excitation technique:   Direct photolysis
Time resolution:   By end product analysis
Analytical technique:   Fourier transform (FTIR)
Comments:   Both Cl (from Cl2 photolysis) and OH (from ethyl nitrate photolysis in the presence of NO and O2) used to generate HCO(O)O from HC(O)CHO.
Concentrations of all species, inculuding N2 and O2 varied over wide ranges.Ratio of rate constants obtained from intercepts of plots of [CO]/[CO2] vs. 1/[O2].Based on an assumed rate constant for the reference reaction of 1 x 10-11 cm3s-1, independent of temperature.Unsymmetric error limits of +9 and -1.4 in A-factor given.

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Rate constant values calculated from the Arrhenius expression:

T (K)k(T) [s-1]
224 1.05E6
225 1.11E6
250 4.54E6
275 1.43E7
300 3.73E7
317 6.56E7