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CN自由基与碳氢化合物的反应对于了解碳氢火焰中NO_x的形成、星球大气中氮的平衡具有重要的意义。以前主要是用宽带闪光光解含氰化合物,产生CN自由基,利用吸收方法临视CN基的浓度随时间的变化来测量反应速率。由于吸收方法灵敏度低,单色仪分辨率不高,难于准确获得不同振动能量CN基的反应速率。我们采用小功率的ArF193毫微米脉冲檄光器,每个光脉冲可产生CN基的数密度为～10~(12)分子厘米~(-3)。因此自由基间的反应可完全忽略。实验中选用C_2N_2作为光解物,光解产物为CN(V″=0,1)。跟踪V″=0,1的浓度随时间的变化,就可获得不同振动能量CN基的反应速率,从而了解振动能量对反应的影响。
The Reaction of CN Radicals with Hydrocarbons It is of great significance to understand the formation of NO x in the flame and the balance of nitrogen in the planetary atmosphere. Previously, broad-band flash photolysis of cyanide-containing compounds to generate CN radicals was used to measure the reaction rate vis-à-vis the change in concentration of CN groups over time using an absorption method. Due to the low sensitivity of the absorption method and the low resolution of the monochromator, it is difficult to accurately obtain the reaction rates of CN radicals with different vibrational energies. We use a small power ArF193 nanometer pulse calender, each pulse can generate CN number density of ~ 10 ~ (12) cm ~ (-3). So the reaction between free radicals can be completely ignored. In the experiment, C_2N_2 was chosen as the photolysis product, and the photolysis product was CN (V “= 0,1). The reaction rate of CN with different vibrational energy was obtained by tracking the change of the concentration of V” = 0,1 with time. Understand the impact of vibrational energy on the reaction.