Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (01): 51-54.doi: 10.3866/PKU.WHXB20030112

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Study on the Rate Constant of the Reaction of C2H3 Radical with Nitric Dioxide

Huang Cun-Shun;Zhu Zhi-Qiang;Ran Qin;Chen Cong-Xiang;Chen Yang   

  1. Key Laboratory of Bond Selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026
  • Received:2002-04-15 Revised:2002-07-19 Published:2003-01-15
  • Contact: Chen Yang

Abstract: The product formation of the reaction of C2H3 radical with NO2 was studied in the gas phase under 2.66×103 Pa total pressure and 298 K. C2H3 radical was generated by laser photolysis of C2H3Br/Ar mixture. In the presence of nitric dioxide (NO2), the formation of OH radicals of the electronic ground states was monitored by laser-induced fluorescence. From the results of time resolved measurements of the OH radical concentrations, bimolecular rate constants for the reactions C2H3+NO2 and OH(X 2Π)+NO2 were determined as k(C2H3+NO2)=(1.8±0.05)×10-11 cm3•molec.-1•s-1 and k(OH+NO2)=(2.1±0.15)×10-12 cm3•molec.-1•s-1.

Key words: C2H3 radical, Laser-induced fluorescence, Rate constant of reaction