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Author(s):   Bedjanian, Y.; Poulet, G.; Le Bras, G.
Title:   Low-Pressure Study of the Reactions of Br Atoms with Alkenes. 3. Reactions with 2-Methyl-2-Butene, 2,3-Dimethyl-2-Butene, and 1-Hexene
Journal:   J. Phys. Chem. A
Volume:   104
Page(s):   577 - 583
Year:   2000
Reference type:   Journal article
Squib:   2000BED/POU577-583

Reaction:   (CH3)2C=CHCH3 + Br· → Adduct
Reaction order:   2
Temperature:   233 - 298 K
Pressure:  1.33E-3 bar
Rate expression:   5.2x10-16 [±2.5x10-16 cm3/molecule s] e15881 [±2079 J/mole]/RT
Bath gas:   He
Category:  Experiment
Data type:   Absolute value measured directly
Experimental procedure:   Flow tube - Data taken vs distance
Excitation technique:   Electron beam
Time resolution:   In real time
Analytical technique:   Mass spectrometry
Comments:   The reaction was studied at 0.5 Torr, 1 Torr, and 2 Torr.Authors assumed the reaction to be pressure dependent.The data obtained at 0.5 Torr and 2 Torr were multiplied and divided by a factor of 2, respectively, to be combined with the data obtained at 1 Torr in order to derive the Arrhenius dependence.Reported uncertainties are one standard deviation for the preexponential factor and two standard deviations for the activation energy.

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Rate constant values calculated from the Arrhenius expression:

T (K)k(T) [cm3/molecule s]
233 1.89E-12
250 1.08E-12
275 5.40E-13
298 3.16E-13