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Kinetics of CH radical reactions with N2O, SO2, OCS, CS2, and SF6

✍ Scribed by S. Zabarnick; J. W. Fleming; M. C. Lin

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
463 KB
Volume
21
Category
Article
ISSN
0538-8066

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✦ Synopsis

Pulsed laser photolysis/laser-induced fluorescence (LIFI is utilized to measure absolute rate constants of CH radical reactions as a function of temperature and pressure. Multiphoton dissociation of CHBr, at 266 nm is employed for the generation of C H (X'I1) radicals. The C H radical relative concentration is monitored by exciting fluorescence on the R1(2) line of the (A2A -X'n) transition at 429.8 nm. A resistively heated cell allows temperature studies to be performed from room temperature to =670 K. The following Arrhenius equations are derived:

With the exception of SF,, the reactions of sulfur containing species proceed at rates that are near the theoretical gas kinetic collision frequency. Additionally, these reactions all have activation energies that are near zero or slightly negative. These obserl-ations a r e consistent with a n insertion-decomposition mechanism being dominant under these conditions.

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