TEMPERATURE EFFECT ON QUENCHING OF CH(A(2)DELTA)

The quenching rate constants of CH(A(2) Delta) radicals by alcohol, al kane, O-2, and C2H4 molecules over the temperature range 297-653 K hav e been measured using laser photolysis of CHBr3 at 266 nm to produce C H(A) radical and time-resolved fluorescence measurements. Under the si multaneous effects of multiple attractive potentials and repulsive bar rier, the temperature dependence of the quenching process of CH(A(2) D elta) is discussed qualitatively based on a modified collision complex model. (C) 1998 Elsevier Science B.V. All rights reserved.