Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (06): 516-520.doi: 10.3866/PKU.WHXB20010609

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Kinetic Studies on Quenching of CCl2(A 1B 1,a3B1) by Alkanes

Gao Yi-De;Hu Chang-Jin;Jin Jin;Chen Yang;Chen Cong-Xiang   

  1. Open Laboratory of Bond Selective Chemistry,Department of Chemical physics,Univ ersity of Science and Technology of China ,Hefei ,Anhui　230026
  • Received:2000-11-06 Revised:2001-02-11 Published:2001-06-15
  • Contact: Chen Cong-Xiang E-mail:cxchen@ustc.edu.cn

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Abstract: CCl2 free radicals were produced by dc discharge of CCl4(in Ar).Ground electronic state CCl2 radical was electronically excited to A 1B1 (0,4,0) state with Nd:YAG laser pumped dye laser at 541.52 nm.Experimental quenching data of CCl2 (A 1B1 and a 3B1) by alkanes were obtained by observing time resolved fluorescence from the excited CCl2 radicals transition,which showed a superposition of two exponential decay components.The stateresolved rate constants kA and ka were first time acquired by analyzing and treating these data by using threelevelmodel,which was put forward by us.kA and ka increase on the whole with increasing the number of C－H bonds in alkanes.

Key words: CCl2(A 1B 1,a3B1), Alkanes, 　Kinetics, Quenching rate constant, Three-level-model