Abstract
CCl2 free radicals were produced by a pulsed dc discharge of CCl4 (in Ar). The ground electronic state CCl2 (X) radical was electronically excited to the Ã1B1 (040) vibronic state with a Nd:YAG laser pumped dye laser at 541.52nm. Experimental quenching data of excited CCl2(Ã1B1 and ã3B1) by ketone molecules were obtained by observing time-resolved total fluorescence signal of the excited CCl2 radical, which showed a superposition of two exponential decay components under the presence of quencher. The quenching rate constants KA of CCl2 (A) state and Ka of CCl2 (a) state were derived by analyzing the experimental data according to a proposed three-level-model involving X̃1A1, Ã1B1, and ã3B1 states. On the whole, KA and Ka increase with increasing the number of CH bonds in ketone molecules.
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