CCl2 free radicals were produced by D. C. discharge of CCl4(in Ar). Ground electronic state CCl2 radical was electronically excited to A^1B1 (0, 3, 0), (0, 4, 0), (1, 3, 0), (0, 6, 0), (1, 4, 0) and (2, 2, 0) vibronic states by Nd:YAG laser pumped dye laser at the wavelength of 550.56, 541.52, 532.25, 524.31, 523.82 and 523.37 nm, respectively. Experimental quenching rate data of CCl2(A^1B1 and a^3B1) by NH3, H2O, CH2Br2, NH(CH3)2, NH(C2H5)2, N(C2H5)3, and n-C6H14 were obtained by observign the time resolved fluorescence signals from the excited CCl2 radical transitions, which showed a superposition of two exponential decay components. The state-resolved rate constnats kA and ka were acquired by analyzing and dealing with these data by using three-level- model, which was put forward by us.

Key words: FREE RADICAL REACTION, DISCHARGE, DICHLOROCARBENE, VIBRATIONAL STATE, QUENCHING, DYNAMICS