Collisional quenching of CCl2 radicals in the A1B1 (0,4,0) and a3B1 states by alcohols

The experimental quenching data for CCl2 in the excited state, A1B1 (0,4,0), by alcohols were obtained through observing its time-resolved total fluorescence signal, which showed a superposition of two exponential decay components. The quenching rate constants KA for CCl2 (A) state and Ka for CCl2 (a) state were derived by analyzing the experimental data according to a proposed three-level-model to deal with CCl2 (X1A1,A1B1,a3B1) system. KA and Ka increase on the whole with increasing the number of C–H bonds in alcohol molecules.