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利用里德堡氢原子飞渡时间谱的方法,进行了甲基自由基在212.5nm 的光解动力学的实验研究.甲基自由基来自于碘甲烷分子在266nm 的光分解.实验测量了不同振动态的甲基自由基通过3s 电子激发态解离的产物 CH_2自由基的平动能分布和角分布,并从平动能分布得到了 CH_2自由基的转动布居.实验同时详细地研究了母体分子甲基自由基的振动和转动激发对光解动力学的影响.实验结果表明母体分乙甲基自由基的伞形振动对于产物的转动激发和角分布均有较大的影响,而母体分子的转动激发只对产物的角分布有较明显的影响.
Photodegradation kinetics of methyl radicals at 212.5 nm was investigated by using the Rydberg hydrogen atom time-of-flight spectrum, which was derived from the photodecomposition of methyl iodide at 266 nm. The kinetic energy distribution and angular distribution of CH_2 radical, which is the product of vibrational methyl radical dissociation through 3s electron state, and the rotational residence of CH_2 radical obtained from the translational energy distribution were studied in detail.Meanwhile, The effects of vibration and rotational excitation of methyl radicals on the photolysis kinetics were studied. The experimental results show that the umbrella vibration of the parent birefringent has a great effect on the rotational excitation and angular distribution of the product, while the parent molecular Rotational excitation has a more obvious effect on the angular distribution of the product.