Two-center interference in electron-impact ionization of molecular hydrogen

被引：19
作者：
Li, Xingyu [1 ,2 ,3 ]
Ren, Xueguang [4 ,5 ]
Hossen, Khokon [4 ,6 ]
Wang, Enliang [4 ]
Chen, Xiangjun [1 ,2 ,3 ]
Dorn, Alexander [4 ]
机构：
[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
[2] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China
[3] Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei 230026, Anhui, Peoples R China
[4] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
[5] Xi An Jiao Tong Univ, Sch Sci, Xian 710049, Shaanxi, Peoples R China
[6] Univ Santiago de Compostela, Santiago De Compostela 15782, Spain
来源：
PHYSICAL REVIEW A | 2018年 / 97卷 / 02期
基金：
美国国家科学基金会;
关键词：
PHOTOIONIZATION;
D O I：
10.1103/PhysRevA.97.022706
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Fast (E-0 = 520 eV) electron-impact ionization of molecular hydrogen (H-2) is studied experimentally and theoretically for a resolved molecular axis angle and 10 eV ejected electron energy. Fully differential cross sections were measured using an electron-electron-ion triple coincidence experiment in which the molecular axis direction is obtained for ionic ground-state dissociation. While predictions from the standard two-wave interference model are in strong disagreement with experiment a multicenter distorted-wave method obtains much better results. This demonstrates the importance of the multicenter ionic potential for the electron emission pattern at low energy and the failure of hitherto widely used simple models which treat molecular ionization as the coherent sum of atomic ionization amplitudes.
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页数：5
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