ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Pulsed laser photolysis/laser-induced fluorescence (LIF) is utilized to measure absolute rate constants of CH radical reactions as a function of temperature and pressure. Multiphoton dissociation of CHBr3 at 266 nm is employed for the generation of CH (X2Π) radicals. The CH radical relative concentration is monitored by exciting fluorescence on the R1(2) line of the (A2Δ - X2Π) 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: \documentclass{article}\pagestyle{empty}\begin{document}$${\rm CH}\,{\rm + }\,{\rm N}_{\rm 2} {\rm O,}\,\,\,\,\,\,\,\,k = (1.59 \pm 0.20)\, \times \,\,10^{ - 11} \,\,\exp [(500 \pm 45)/T]{\rm cm}^{\rm 3} {\rm s}^{{\rm - 1}};$$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$${\rm CH}\,{\rm + }\,{\rm SO}_{\rm 2} {\rm ,}\,\,\,\,\,\,\,\,k = (1.32 \pm 0.17)\, \times \,\,\,10^{ - 10} \,\,\exp [(250 \pm 45)/T]\,\,{\rm cm}^{\rm 3} {\rm s}^{{\rm - 1}};$$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$${\rm CH}\,{\rm + }\,{\rm OCS,}\,\,\,\,\,\,\,\,k = (1.99 \pm 0.11)\, \times \,\,\,10^{ - 10} \,\,\exp [(190 \pm 20)/T]\,\,{\rm cm}^{\rm 3} {\rm s}^{{\rm - 1}};$$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$${\rm CH}\,{\rm + }\,{\rm CS}_{\rm 2} {\rm ,}\,\,\,\,\,\,\,\,k = (3.49 \pm 0.36)\, \times \,\,\,10^{ - 10} \,\,\exp [- (40 \pm 35)/T]\,\,{\rm cm}^{\rm 3} {\rm s}^{{\rm - 1}};$$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$${\rm CH}\,{\rm + }\,{\rm SF}_{\rm 6} {\rm ,}\,\,\,\,\,\,\,\,k 〈 5\,\,\, \times \,\,\,10^{ - 17} {\rm cm}^{\rm 3} {\rm s}^{{\rm - 1}} .$$\end{document} With the exception of SF6, 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 observations are consistent with an insertion-decomposition mechanism being dominant under these conditions.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550210905
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