物理化学学报 >> 2003, Vol. 19 >> Issue (01): 51-54.doi: 10.3866/PKU.WHXB20030112

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C2H3＋NO2反应速率常数的研究

黄存顺;朱志强;冉琴;陈从香;陈旸   

  1. 中国科学院选键化学重点实验室,中国科技大学化学物理系,合肥　230026
  • 收稿日期:2002-04-15 修回日期:2002-07-19 发布日期:2003-01-15
  • 通讯作者: 陈旸 E-mail:yangchen@ustc.edu.cn

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 E-mail:yangchen@ustc.edu.cn

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摘要： 利用激光光解C2H3Br产生C2H3自由基,在气相298 K, 总压2.66×103 Pa的条件下,研究C2H3与NO2的反应,用激光光解-激光诱导荧光（LP-LIF）检测中间产物OH自由基的相对浓度随着反应时间的变化关系,报导了双分子反应C2H3＋NO2的速率常数k(C2H3＋NO2)=(1.8±0.05)×10－11cm3•molec.－1•s－1,同时也得到OH＋NO2反应的速率常数k(OH＋NO2)=(2.1±0.15)×10－12 cm3•molec.－1•s－1.

关键词: C2H3 自由基, 激光诱导荧光, 反应速率常数

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