阈值光电子-光离子符合速度成像技术的初步应用

Initial applications of threshold photoelectron-photoion coincidence velocity imaging technique

基于同步辐射的阈值光电子-光离子符合速度成像技术采用双速度聚焦电场同时控制电子和离子的飞行轨迹,提高了收集效率和能量分辨率.应用该技术开展了一些原子和分子的实验研究,分别测量了相应的阈值光电子谱、阈值光电子-光离子符合质谱、阈值光电子-光离子符合光谱和阈值光电子-光离子符合速度成像,展现了该技术在离子结构分析、混合物成分辨别和具有态选择的离子解离动力学等方面的初步应用。

Threshold photoelectron-photoion coincidence（TPEPICO） velocity imaging based on synchrotron radiation ionization utilizes a double velocity map imaging to simulateneously control the trajectories of electron and ion,thus improving their collection efficiencies and energy resolutions.Using this technique,some experimental investigations of atoms and molecules were performed,and the corresponding threshold photoelectron spectroscopy（TPES）,TPEPICO time-of-flight mass spectroscopy,TPEPICO spectroscopy,and TPEPICO velocity imaging were measured.Therefore,this novel technique can be applied to studies of ionic structure,identification of components in mixture and dissociation dynamics of state-selected ions.