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

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.