Temperature dependence of the CN radical reactions with C 2 H 2 and C 2 H 4

D. A. Lichtin*, Ming-Chang Lin

*Corresponding author for this work

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Abstract

The temperature dependence of the reaction rates for CN radicals with C 2 H 4 and C 2 H 4 and C 2 H 2 has been measured from room temperature to 700 K. The two laser photoionization/LIF-probe technique was used by photolyzing ICN at 266 nm and monitoring CN depletion via B ↔ X LIF at 388 nm. A resistively heated slow-flow gas reactor was employed at 50 Torr total pressure for the temperature dependence study. Both reactions were found to have rate constants that decreased with temperature, fitting k C 2 H 4 = (4.72±0.25)×10 -11 exp[(509±20)/T] and k C 2 H 2 = (3.49±10 -11 exp[(571±23)/T] cm 3 molecule -1 s -1 , indicating that both reactions occur by addition-elimination mechanism. No pressure dependence was observed within experimental errors.

Original languageEnglish
Pages (from-to)325-330
Number of pages6
JournalChemical Physics
Volume104
Issue number2
DOIs
StatePublished - 1 May 1986

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