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本文研究了单次碰撞条件下Ba(~3D)+N_2O→BaO~*+N_2反应的动态学特性。由束气实验测出这个反应的化学发光截面是42.2±1.4(?)~2,总碰撞截面是142±11(?)~2。由化学发光光谱分析出反应产物中存在着BaOD~1∑~+→A~1∑~+→X~1∑~+二次电子跃迁过程。通过交叉分子束实验,研究化学发光截面与反应物振动能、碰撞能的关系。结果表明,这个反应的势能面不存在阈能垒,振动能对化学发光截面影响不大,而平动能的增加会使化学发光截面减小。本文采用信息论方法,计算产物态的分支比,并和实验结果进行对比分析。
In this paper, the dynamic characteristics of Ba (~ 3D) + N 2 O → BaO ~ * + N 2 reaction under single collision conditions are studied. The beam cross-section was 42.2 ± 1.4 (?) ~ 2 and the total cross-section was 142 ± 11 (?) ~ 2. The chemical transition of BaOD ~ 1Σ ~ + → A ~ 1Σ ~ + → X ~ 1Σ ~ + in the reaction product was analyzed by chemiluminescence spectroscopy. The cross-molecular beam experiment was used to study the relationship between the chemiluminescence cross section and the reactant vibrational energy and collision energy. The results show that there is no threshold energy barrier in the potential energy surface of the reaction, and the vibration energy has little effect on the chemiluminescence cross section, while the increase of the translational energy results in the reduction of the chemiluminescence cross section. In this paper, the information theory method is used to calculate the branching ratio of product states, and compared with the experimental results.