CH(A2Δ–X2Π) and OH(A2Σ+–X2Π) chemiluminescent radiation from O(3P)+ C6H6 discharge–fast-flow mixtures

Abstract

Using a discharge–fast-flow apparatus a study of the CH* and OH* chemiluminescent radiation produced in O(³P)+C₆H₆ reactive mixtures has been carried out. CH* and OH* emission intensities centred at 4315 and 3090 Å have been assigned to the CH(A²Δ–X²Π) and OH(A²Σ⁺–X²Π) electronic transitions, respectively, and monitored as a function of reactant concentrations for several temperatures. The following empirical relations for their emission intensities have been obtained: I(CH*)=a₁[B] exp (–b₁[B]) and I(OH*)=a₂[B]² exp (–b₂[B]) where [B] is the concentration of benzene and a_i and b_i(i= 1, 2) are empirical factors independent of [B]. An absolute kinetic determination of the CH* chemiluminescent reaction, using the NO + O glow as a standard, has been determined, leading to an estimate of the quantum yield of ϕ(CH*)= 0.06.