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Kinetics of the cross reaction between methyl and hydroxyl radicals

✍ Scribed by Kjell Fagerström; Anders Lund; Gharib Mahmoud; Jerzy T. Jodkowski; Emil Ratajczak

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
746 KB
Volume
204
Category
Article
ISSN
0009-2614

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✦ Synopsis

The kinetics of the reaction CH,+OH (+M)dCH,OH (+M) was studied at room temperature by pulse radiolysis of SF,/ CHJH# mixtures. The methyl radical decay was followed by monitoring the UV absorption signals at 216.4 nm. A pressure dependence of k, was observed with values ranging from (5.8 kO.3) x 10"M-' s-' at 85 mbar to (7.8&0.7)X 10" M-' s-' at 1000 mbar SF,. The high-and low-pressure limiting rate constants were calculated. k ,,_ is for the temperature range 200-500 K expressed as (8.7kO.9) x 10"~ (T/300)'.' M-' s-l. The low-pressure limiting rate constant is estimated to be k& [SF,] = (2.6*2.3)X 10'5M-Zs-' at room temperature.

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