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Author(s):   Stoliarov, S.I.; Knyazev, V.D.; Slagle, I.R.
Title:   Experimental Study of the Reaction Between Vinyl and Methyl Radicals in the Gas Phase. Temperature and Pressure Dependence of Overall Rate Constants and Product Yields
Journal:   J. Phys. Chem. A
Volume:   104
Page(s):   9687 - 9697
Year:   2000
Reference type:   Journal article
Squib:   2000STO/KNY9687-9697

Reaction:   ·CH3 + C2H3CH4 + C2H2
Reaction order:   2
Temperature:   300 - 900 K
Pressure:  3.00E11 - 1.20E12 bar
Rate expression:   1.5x10-11 [cm3/molecule s] e3201 [J/mole]/RT
Uncertainty:   0.400000006
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:   Mass spectrometry
Comments:   Laser Photolysis / Photoionization Mass Spectrometry experiments were performed to determine the rates and product yields of the C2H3 + CH3 reaction. Propene, acetylene, and allyl radicals were identified as primary products of the reaction. Quantitative branching fractions of individual channels were obtained as functions of pressure and temperature.

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Rate constant values calculated from the Arrhenius expression:

T (K)k(T) [cm3/molecule s]
300 5.41E-11
350 4.51E-11
400 3.93E-11
450 3.53E-11
500 3.24E-11
550 3.02E-11
600 2.85E-11
650 2.71E-11
700 2.60E-11
750 2.51E-11
800 2.43E-11
850 2.36E-11
900 2.30E-11