Kinetic studies on reactions of NCO(X 2Πi) with alcohol molecules

Abstract

In this work, NCO radicals were produced by laser photolysis of CHBr3 at 266 nm followed by the reaction of the produced CH with NO in the photolysis reaction. The NCO radicals were then electronically excited from the ground state to the A2Σ+ state with a Nd:YAG laser pumped dye laser at 438.6 nm in the Q sub-band of A2Σ+(0000)←X 2Πi(0010). The Laser induced fluorescence (LIF) intensities (taken as the area of the time-resolved LIF signal) as function of the delay time between the photolysis and probe lasers were measured. The reaction rate constants of NCO in ground state with alcohol molecules were measured by analyzing the time dependence of the LIF intensity. It is found that the reaction rate constant of NCO with alcohol molecule is larger than that with corresponding alkane molecule. The inductive effect of the OH group in alcohol molecule on the activation energy of the reaction NCO+alcohol is discussed.