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阈值光电子-光离子符合速度成像技术通过对光电子和符合的光离子同时进行速度聚焦控制,大幅提高了电子和离子的收集效率和离子平动能分辨率,成为开展气相分子光电离和光电离-解离动力学研究的有效工具.利用该技术,我们精确地测量了分子的电离能、离子出现势等重要参数,并且开展了若干具有量子态或内能选择的离子解离动力学研究,描绘了相关势能面存在浅势阱等重要动力学特征,讨论了不同振动态和电子态的激发对解离机理和产物通道的重要影响.
The threshold photoelectron-photoion coincidence velocity imaging technique greatly improves the collection efficiency of electrons and ions and the resolution of ion translational kinetic energy by controlling the photoelectron and coincident photo-ion simultaneously with speed focusing, and becomes the target of photoionization and photoionization An effective tool for studying the dynamics of dissociation.We used this technique to accurately measure important parameters such as ionization potential and ion appearance potential of molecules and carried out a number of ion dissociation kinetic studies with quantum states or internal energy choices, There are some important dynamic characteristics such as shallow wells in the related potential energy surface. The influence of different vibration states and electronic states on dissociation mechanism and product channel are discussed.