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Kinetics of the gas phase reaction of OH radicals with pyrrole and thiophene

✍ Scribed by Timothy J. Wallington

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
443 KB
Volume
18
Category
Article
ISSN
0538-8066

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✦ Synopsis

Absolute rate constants for the gas phase reaction of OH radicals with pyrrole tk,) and thiophene ( k , ) have been measured over the temperature ranges 298-440 and 274-382 K, respectively, using the flash photolysis-resonance fluorescence technique. The rate constants obtained were independent of the total pressure of argon diluent over the range 25-100 torr and were fit by the Arrhenius expressions k , = (2.7 2 : : )

x 10 ~' ' exp((403 t 93)/T] cm3 molecule-' s-' and k , = (1.2:;;) x exp[(584 t 2171/T] cm3 molecule-' s-' with rate constants a t 298 ir 2 K of k, = 11.03 ? 0.061 x lo-'" cm3 molecule-s-' and k , = (8.9 t-0.7) x lo-" cm3 molecule ' s-'. [These errors represent two standard deviations (systematic errors could constitute an additional ca. 10% uncertainty)]. These results are discussed with respect to the previous literature data and the atmospheric lifetimes of pyrrole and thiophene.

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