论文标题
通过速度切片成像探测的电子碰撞中电子碰撞的离子对解离动力学
Ion-pair dissociation dynamics in electron collision with carbon dioxide probed by velocity slice imaging
论文作者
论文摘要
已经使用基于飞行时间（TOF）的质谱与高度差异速度切片成像（VSI）技术相结合的基于飞行时间（TOF）的质谱（VSI）技术研究了与气相二氧化碳分子的离子对分离（IPD）。碎裂阴离子的外观能为离子对生产提供了实验阈值能量值。片段阴离子的动能（KE）分布和角度分布（AD）分配了对IPD动力学的详细见解。 KE分布清楚地表明，IPD动力学可能是由于直接访问离子对状态。但是，间接机制不能在较高入射的电子能量下排除。角度分布数据明确鉴定出与Sigma对称性相关的离子对状态的参与，并且PI对称状态的较小贡献。使用密度功能理论（DFT）的计算计算强烈支持实验观测。
Ion-pair dissociation (IPD) to gas phase carbon dioxide molecule has been studied using time of flight (TOF) based mass spectroscopy in combination with the highly differential velocity slice imaging (VSI) technique. The appearance energy of the fragmented anion provides the experimental threshold energy value for ion-pair production. The kinetic energy (KE) distributions and angular distributions (AD) of the fragment anion dispense the detailed insight into the IPD dynamics. The KE distribution clearly reveals that the IPD dynamics may be due to the direct access to the ion-pair states. However, indirect mechanism can't be ruled out at higher incident electron energies. The angular distribution data unambiguously identified the involvement of the ion-pair state associated with Sigma symmetry and a minor contribution from Pi symmetric states. Computational calculations using density functional theory (DFT) strongly support the experimental observations.
