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Temperature dependence of the CH+N2 reaction at low total pressure

โœ Scribed by K.H. Becker; B. Engelhardt; H. Geiger; R. Kurtenbach; G. Schrey; P. Wiesen

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
636 KB
Volume
195
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

The reaction CH(X *II) +NZ was studied as a function of temperature in the range 301-894 K at 20 Torr total pressure. CH radicals were generated by excimer laser photolysis of CHClBr*/Ar mixtures and were detected by laser-induced fluorescence. The reaction proceeds along two pathways, below 673 K the rate constants exhibit a negative temperature dependence with an activation energy of -9.57 + 0.32 kJ/mol consistent with an adduct formation followed by collisional stabilization. From the rate constants above 673 K, where the production of HCN+N dominates an activation energy of 53.1 kJ/mol was estimated for the abstraction pathway. A transition state theory model was applied to analyze the experimental results.

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