NO(A 2Σ+–X2Π) chemiluminescence from the reaction C(1D)+NO2 at 300 K

Abstract
The metastable‐state atomic carbon C(1D,1S) as well as the ground‐state atomic carbon, C(3P), were produced at 300 K from the He(2 3S)+CO dissociative excitation by using a flowing afterglow apparatus. An intense ultraviolet chemiluminescence corresponding to the NO(A 2+X2Π) transition was observed when NO2 was added, which was attributed to the reaction C(1D)+NO2 → NO(A 2+)+CO. The specific production of NO(A 2+) from the C(1D) reactants is explained by adiabatic correlation arguments.