四氟化碳分子电离解离过程中的异构化动力学
Isomerization dynamics in dissociative ionization of carbon tetrafluoride
涂宁远 1陈磊 1赵文超 1单旭 1王恩亮 1陈向军1
作者信息
- 1. 中国科学技术大学 物理学院近代物理系,合肥 230026
- 折叠
摘要
采用离子动量成像谱仪研究了能量为1.0 keV的电子束碰撞条件下CF4分子的解离动力学.实验上,对解离离子的三维动量进行了成像测量,通过离子飞行时间关联谱识别了CF42+ 异构化生成F2+ 分子的两个通道:F2+ + CF2+ 与CF+ + F2+ + F,得到了两个通道的离子动能及动能释放分布.对于其中的三体解离通道,我们进一步采用Dalitz图与Newton图等三体动力学分析方法对解离碎片的动量关联进行了分析.该通道以两个带电离子的背对背出射为主,中性的F原子作为旁观者只得到极小的反冲动量.
Abstract
The dissociation dynamics of CF4 molecules by electron collisions with impact energy of 1.0 keV was studied by using an ion momentum imaging spectrometer.In the experiment,the three-dimensional momentum vectors of the fragment ions were measured and two isomerization channels for F2+ formation from CF42+,i.e.F2+ + CF2+ and CF+ + F2+ + F,were identified by ion time-of-flight correlation map.The kinetic energy and kinetic energy release distributions of the two channels were obtained.For the three-body dissociation channel,we analyzed the momentum correlation of the dissociated fragments using the three-body dynamics analysis schemes such as the Dalitz diagram and Newton diagram.The channel is dominated by the back-to-back emission of two charged ions,and the neutral F atom acts as a spectator which only gets a very small recoil mo-mentum.
关键词
四氟化碳/异构化/分子解离动力学Key words
Carbon tetrafluoride/Isomerization/Molecular fragmentation dynamics引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据