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Citation: Pan Dan-Xia, Yu Yong, Dong Wen-Bo, Zheng Lu, Lu Xiao, Yao Si-De, Hou Hui-Qi. Study On the Laser Flash Photolysis of Carbon Tetrachloride[J]. Acta Physico-Chimica Sinica, ;2004, 20(09): 1099-1103. doi: 10.3866/PKU.WHXB20040908 shu

Study On the Laser Flash Photolysis of Carbon Tetrachloride

1.
Institute of Environment Science, Fudan University, Shanghai　200433; 1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai　201800

Received Date: 5 January 2004
Available Online: 15 September 2004

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.
- Laser photolysis;Carbon tetrachloride;Flash;Transient substance;　Free radical
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