Infrared laser kinetic spectroscopy in discharges: The CN radical (v =0–7)

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Abstract
Infrared laser kinetic spectroscopy was extended to the study of formation and decomposition processes in a hollow cathode discharge. The processes responsible for the disappearance of the CN radical in different vibrational states (v=0–7) were investigated. From the time evolution of the signal, information on the reaction rates of vibrationally excited CN molecules with C2N2 and on their vibrational relaxation could be obtained. The measured first order reaction rate constants lie between 350–800 s−1 and the rate constants for the deactivation, which is thought to be due to V–V relaxation in collisions with C2N2, between 520–900 s−1 for the v=0–7 states of CN.