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Author(s):   Douglas, K.M.; Blitz, M.A.; Feng, W.; Heard, D.E.; Plane, J.M.C.; Rashid, H.; Seakins, P.W.
Title:   Low temperature studies of the rate coefficients and branching ratios of reactive loss vs quenching for the reactions of (CH2)-C-1 with C2H6, C2H4, C2H2
Journal:   Icarus
Volume:   321
Page(s):   752 - 766
Year:   2019
Reference type:   Journal article
Squib:   2019DOU/BLI752-766

Reaction:   CH_2(aA_1) + C2H4·CH2CH=CH2 +
Reaction order:   2
Reference reaction:   CH_2(aA_1) + C2H4 → Products
Reference reaction order:   2
Temperature:   100 - 498 K
Pressure:  3.20E11 - 2.41E12 bar
Rate expression:   1.57±2.9x10-1 e-1655 [±382 J/mole]/RT
Category:  Experiment
Data type:   Experimental value and limited review
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:   Laser induced fluorescence
Comments:   The kinetics of the reactions of the first excited state of methylene has been measured over the temperature range 43–298 K. Low temperatures were obtained using a pulsed Laval expansion (43–134 K), while a slow flow reaction cell was used for temperatures of 160 K and above. The quoted expressions were obtained by combining the results of this study with other literature data.

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Rate constant values calculated from the Arrhenius expression:

T (K)k(T) []
100 2.15E-1
125 3.20E-1
150 4.17E-1
175 5.04E-1
200 5.80E-1
225 6.48E-1
250 7.08E-1
275 7.61E-1
300 8.09E-1
325 8.51E-1
350 8.89E-1
375 9.23E-1
400 9.55E-1
425 9.83E-1
450 1.01E0
475 1.03E0
498 1.05E0