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Author(s):   Friedrichs, G.; Herbon, J.T.; Davidson, D.F.; Hanson, R.K.
Title:   Quantitative Detection of HCO Behind Shock Waves: The Thermal Decomposition of HCO
Journal:   Phys. Chem. Chem. Phys.
Volume:   4
Page(s):   5778 - 5788
Year:   2002
Reference type:   Journal article
Squib:   2002FRI/HER5778-5788

Reaction:   HCO + CO + H2
Reaction order:   2
Temperature:   295 - 820 K
Pressure:  0.28 - 1.90 bar
Rate expression:   1.83x10-10 [cm3/molecule s]
Uncertainty:   1.32000005
Bath gas:   Ar
Category:  Experiment
Data type:   Derived from fitting to a complex mechanism
Pressure dependence:   None reported
Experimental procedure:   Shock tube
Excitation technique:   Flash photolysis (laser or conventional)
Time resolution:   In real time
Analytical technique:   Other (direct)
Comments:   The authors generated formyl radicals (HC=O) by laser photolysis of H2C=O, both at room temperature and behind incident or reflected shock waves at temperatures between 570 K and 1230 K. The formyl radicals were detected and their decay followed in real time by the use of frequency modulation (FM) spectroscopy. At temperatures below 820 K the decays were sensitive to the rates of H + HCO = H2 + CO and HCO + HCO = CH2O + CO and best fit values were determined by chemical kinetic modeling using GRI-Mech 3.0 as the base mechanism. At temperatures greater than 835 K the decays were sensitive to the unimolecular decomposition reaction HCO = H+CO and the rate of this reaction was determined.

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