High-resolution (e, 2e + ion) study of electron-impact ionization and fragmentation of methane.
High-resolution (e, 2e + ion) study of electron-impact ionization and fragmentation of methane.
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DOI：
10.1063/1.4919691
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
X. Ren;T. Pflüger;M. Weyland;W. Baek;H. Rabus;J. Ullrich;A. Dorn
中科院分区：
文献类型：
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作者：
X. Ren;T. Pflüger;M. Weyland;W. Baek;H. Rabus;J. Ullrich;A. Dorn
利用反应显微镜研究了低能（E0 = 66 eV）电子碰撞引起的甲烷的电离和裂解。所有三个带电的末态粒子，两个传出的电子，和一个碎片离子的动量矢量，检测重合。与早期的研究[Xu et al.，J.Chem.Phys.138，134307（2013）]，已经实现了对仪器质量和能量分辨率的相当大的改进。片段产物CH4（+）、CH3（+）、CH2（+）、CH（+）和C（+）清晰分离。结合能分辨率ΔE = 2.0 eV，比早期测量的结果好三倍。通过测量离子动能分布和结合能谱研究了碎裂通道。虽然与现有的光电离研究结果基本一致，但结果显示出差异，包括缺失的碎片通道和以前看不见的通道。
The ionization and fragmentation of methane induced by low-energy (E0 = 66 eV) electron-impact is investigated using a reaction microscope. The momentum vectors of all three charged final state particles, two outgoing electrons, and one fragment ion, are detected in coincidence. Compared to the earlier study [Xu et al., J. Chem. Phys. 138, 134307 (2013)], considerable improvements to the instrumental mass and energy resolutions have been achieved. The fragment products CH4 (+), CH3 (+), CH2 (+), CH(+), and C(+) are clearly resolved. The binding energy resolution of ΔE = 2.0 eV is a factor of three better than in the earlier measurements. The fragmentation channels are investigated by measuring the ion kinetic energy distributions and the binding energy spectra. While being mostly in consistence with existing photoionization studies the results show differences including missing fragmentation channels and previously unseen channels.