›› 2015, Vol. 24 ›› Issue (3): 33403-033403.doi: 10.1088/1674-1056/24/3/033403
• ATOMIC AND MOLECULAR PHYSICS • 上一篇 下一篇
祁月盈a, 叶丹丹a, 王建国b, 屈一至c
Qi Yue-Ying (祁月盈)a, Ye Dan-Dan (叶丹丹)a, Wang Jian-Guo (王建国)b, Qu Yi-Zhi (屈一至)c
摘要: The plasma screening of fast-electron-impact-ionization by excited state (3p) of Hydrogen-like ions was investigated in the first Born approximation with a plasma screening length δ varying from 1000a0 to 10a0. The generalized oscillator strength densities showed dramatic changes: some accessional minima occurred along with a remarkable enhancement in certain continuum-energy domains. The double-differential cross sections exhibit not only the same structures as the Bethe surface for moderate and large momentum transfers, but also a broadened enhancement for small momentum transfers. The single-differential cross sections exhibit a near-zero-energy-enhancement and prodigious multiple-shape resonances, depending on the continuum energy and the plasma screening length. These features are analogous to those of the photo-ionization cross section. These findings, for both types of cross section, can be explained by processes associated with continuum electrons, as long as the potential has a short-range character.
中图分类号: (Atomic excitation and ionization)