Study of NCl(a~1Δ) and NCl(b~1Σ) from the reaction of HN_3+Cl

NCl(a 1Δ) and NCl(b 1Σ) were produced from the reaction of HN 3 with Cl generated by the microwave discharge of Cl 2. The emission spectrum of NCl(a 1Δ) and NCl(b 1Σ) were observed and their intensities dependent on the Cl 2 flow rate and the ratio of He flow rate to Cl 2 flow rate were investigated. The results suggest that there is an optimum range of Cl 2 flow rate for the intensity of NCl(a 1Δ) and NCl(b 1Σ) emission at a fixed He flow rate, and the optimum ratio of He flow rate to Cl 2 flow rate increases with the increasing He flow rate. The optimum He∶Cl 2 is 30∶1 to 100∶1 under this experimental conditions(He flow rate being 5-40 L/min).