Study of NCl(a1D ) and NCl(b1S ) from the reaction of HN3+Cl

NCl(a1D ) and NCl(b1S ) were produced from the reaction of HN3 with Cl generated by the microwave discharge of Cl2. The emission spectrum of NCl(a1D ) and NCl(b1S ) were observe d and their intensities dependent on the Cl2 flow rate and the ratio of He flow rate to Cl2 flow rate were investigated. The results suggest that there is a n optimum range of Cl2 flow rate for the intensity of NCl(a1D ) and NCl(b1S ) emission at a fixed He flow rate, and the optimum ratio of He flow rate to C l2 flow rate increases with the increasing He flow rate. The optimum He∶Cl2 is 30∶1 to 100∶1 under this experimental conditions（He flow rate being 5~40 L/min）. 