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Author(s):   Elsamra, R.MI.; Vranckx, S.; Carl, S.A.
Title:   CH(A2«DELTA») formation in hydrocarbon combustion: The temperature dependence of the rate constant of the reaction C2H+O2 -> CH(A2«DELTA»)+CO2
Journal:   J. Phys. Chem. A
Volume:   109
Page(s):   10287 - 10293
Year:   2005
Reference type:   Journal article
Squib:   2005ELS/VRA10287-10293

Reaction:   ·C2H + O2 → CH(A2Delta, B2Sigma-) + CO2
Reaction order:   2
Temperature:   316 - 837 K
Pressure:  1.20E-2 - 1.33E-2 bar
Rate expression:   7.7x10-17 [cm3/molecule s] (T/298 K)4.40 e9562 [±1247 J/mole]/RT
Category:  Experiment
Data type:   Absolute value measured directly
Pressure dependence:   Rate constant is pressure independent
Experimental procedure:   Static or low flow - Data taken vs time
Excitation technique:   Flash photolysis (laser or conventional)
Time resolution:   In real time
Analytical technique:   Vis-UV emission
Comments:   195-nm photolysis of N2O used as source of O. C2H generated by photolysis of C2H2.
Lifetime of CH(A) in N2 also determined.
The preexponential factor based on rate constant for C2H + O(3P) -> CH(A) + CO of k = (1.0±0.5)x10-11exp(-230/T) cm3s-1 and the relative rate to this reaction at 250 K. This preexponential factor is considered uncertain to a factor of 10, but the relative rate constant k/k(300) is considered much more accurate.

View full bibliographic record.


Rate constant values calculated from the Arrhenius expression:

T (K)k(T) [cm3/molecule s]
316 3.79E-15
350 4.18E-15
400 4.98E-15
450 6.08E-15
500 7.49E-15
550 9.24E-15
600 1.14E-14
650 1.40E-14
700 1.71E-14
750 2.07E-14
800 2.50E-14
837 2.86E-14