N2 dissociative ionization by electron impact

30th International Conference on Photonic, Electronic, and Atomic Collisions

Zhang, Y.^1 ; Wang, X.^1 ; Zhu, L.F.^2 ; Lu, D.^1 ; Hutton, R.^1 ; Zou, Y.^1 ; Wei, B.^1

Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai

200433, China^1

Hefei National Laboratory for Physical Sciences at Microscale, Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui

230026, China^2

关键词: Cold target recoil ion momentum spectroscopies;    Coulomb explosion;    Dissociation channels;    Dissociative ionization;    Electron impact;    Electron impact energy;    Kinetic energy release;    Molecular ions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/875/7/062019/pdf
DOI  :  10.1088/1742-6596/875/7/062019

来源: IOP

【 摘 要 】

Synopsis Dissociative single, double and triple ionization of N2 induced by 200, 400 and 1000 eV electron impact are studied using the cold target recoil-ion momentum spectroscopy (COLTRIMS) technique. Kinetic energy releases (KERs) are determined for dissociation channels (N2+→ N++ N, N22+→ N2++ N) and Coulomb explosion channels (N22+→ N++ N+, N23+→ N2++ N+). It is observed that as the electron-impact energy increasing, different channels behave quite differently. Through analyzing the electronic states of the precursor molecular ion in each channel, the present KER measurements show that ionization from different valance orbitals plays a very important role in the dissociation of molecules.