Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (09): 1099 -1103.doi: 10.3866/PKU.WHXB20040908

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Study On the Laser Flash Photolysis of Carbon Tetrachloride

Pan Dan-Xia;Yu Yong;Dong Wen-Bo;Zheng Lu;Lu Xiao;Yao Si-De;Hou Hui-Qi   

  1. Institute of Environment Science, Fudan University, Shanghai 200433; 1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800
  • Received:2004-01-05 Revised:2004-05-01 Published:2004-09-15
  • Contact: Hou Hui-Qi

Abstract: Carbon tetrachloride was subjected to transient laser flash photolysis in the presence or absence of oxygen, transient absorption spectra were observed and analyzed. The experiment indicates that a series of micro-reactions occurred under 248 nm laser by a single photon absorption of CCl4, including the dissociation of the solvent and the formation of sophisticated substances-{CCl4-Cl}σ charge transfer complex,( CCl3+…Cl-) ion pair and CCl3O2. These absorptions decay according to the first order kinetics, and the decay rate constants of {CCl4-Cl}σ charge transfer complex were obtained to be 3.38×106 s-1 and 3.65×106 s-1 in the presence and absence of oxygen, respectively, and its production has nothing to do with the oxygen. The decay rate constants of (CCl3+…Cl-) were also gained to be 3.73×107 s-1 and 3.02×107 s-1 in the presence and absent of oxygen, respectively. However, CCl3O2 exists only in the presence of oxygen with a decay rate constant of 2.32×104 s-1.

Key words: Laser photolysis, Carbon tetrachloride, Flash, Transient substance,  Free radical