Abstract
Rate constants for quenching ofCH 2 (b̃ 1B 1) Σ(0,14,0) by six hydrocarbons have been measured. 1B 1 methylene was prepared by a two-step process. In the first step ketene was photodissociated by a XeCl excimer laser yielding CH 2 (ã 1A 1). Subsequently CH 2 ( 1B 1) was populated by dye-laser absorption from the previously prepared 1A 1 state. Time-resolved fluorescence from the 1B 1 state was observed and the quenching with added gases and vapors studied. The measured quenching rate constants for linear hydrocarbons C 2H 6, C 2H 4 and C 2H 2 and cyclic C 6H 12, C 6H 10 and C 6H 6 are 5.3,8.1,9.5,7.5, 10.0 and 12.0 (i s −1), respectively. The rate constants were found to increase with the degree of unsaturation of the carbon-carbon bond of the quencher and are all larger than the gas kinetic rate.
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