高分辨交叉分子束实验研究F+HD→HF+D在碰撞能为5.43～18.73 kJ/mol的反应
High Resolution Crossed Molecular Beams Study on the F+HD→HF+D Reaction at Collision Energy of 5.43?18.73 kJ/mol
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摘要: 运用高分辨的H/D原子里德堡标记飞行时间谱方法，研究了F+HD→HF+D反应在5.43～18.73 kJ/mol十个碰撞能下的动力学过程. 获取了产物振转态分辨的微分截面. HF(v′=2)前向产物的强度随着碰撞能的增大而降低，表明随着碰撞能的增大共振贡献减弱. 当碰撞能高于HF(v′=3)产物的阈值能量时，观察到了该产物的前向散射峰. 分析了总能量在产物振动、转动和平动中的分配以及HF产物的振动分支比随碰撞能的变化关系.Abstract: The dynamics of F+HD→HF+D reaction has been studied at ten collision energies rang-ing from 5.43 kJ/mol to 18.73 kJ/mol using high-resolution H/D atom Rydberg tagging time-of-flight method. Product vibrational and rotational state-resolved differential cross sections have been determined. The intensity of the HF(v′=2) forward products decreases as the collision energy increases, suggesting that the resonance contribution is reduced as the collision energy increases. The forward peak of HF(v′=3) product has also been observed above the threshold of this product channel. Product energy disposals in different degrees offreedom have been analyzed. The collision energy dependence of the HF vibrational product branching was also determined. This work presents a comprehensive dynamic picture of this resonance mediated reaction in a wide collision energy regime, providing a good test ground for theoretical understandings of this interesting reaction at higher collision energies.
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