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本文认为Ar~+激光(488nm)引起的CH_4/CH_2D_2光溴化反应应该是Br_2先被激发到Br_2~*,然后再离解为两个原子,因此,还要考虑Br_2~*也会参加反应。根据这个机理,反应常数λ与激光光强I的关系为λ=λ_1I~(1/2)+λ_2I。通过实验证明λ_2I为重要项。并测得在T=423K,455K,471K时,CH_4与CH_2D_2光溴化反应常数比λ_H/λ_D=1.9、1.65、1.65。实验证明反应常数λ服从Arrhenius定律,且计算出激活能分别为E_H=17.5kcal/mole和E_D=18.9kcal/mole。
This paper argues that the bromination reaction of CH_4 / CH_2 D_2 induced by Ar ~ + laser (488nm) should be that Br_2 is firstly excited to Br_2 ~ * and then dissociated into two atoms. Therefore, it is also necessary to consider that Br_2 ~ * also participate in the reaction. According to this mechanism, the relationship between the reaction constant λ and the laser intensity I is λ = λ_1I ~ (1/2) + λ_2I. Experiments show that λ_2I is an important item. The results showed that the ratio of bromination reaction between CH_4 and CH_2D_2 was λ_H / λ_D = 1.9, 1.65 and 1.65 at T = 423K, 455K and 471K. The experimental results show that the reaction constant λ obeys Arrhenius law, and the activation energies are calculated as E_H = 17.5 kcal / mole and E_D = 18.9 kcal / mole, respectively.