Fast-electron-impact ionization process by 3p of hydrogen-like ions in Debye plasmas  

作　　者：祁月盈 叶丹丹 王建国 屈一至 

机构地区：[1]School of Mathematical & Physics and Information Engineering,Jiaxing University [2]Institute of Applied Physics and Computational Mathematics [3]College of Material Sciences and Optoelectronic Technology,University of Chinese Academy of Sciences

出　　处：《Chinese Physics B》2015年第3期143-148,共6页中国物理B（英文版）

基　　金：supported by the National Basic Research Program of China(Grant No.2013CB922200);the National Natural Science Foundation of China(Grant Nos.11005049,11025417,and 10974021)

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 photoionization 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.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 photoionization 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.

关 键 词：near-zero-energy enhancement multiple shape resonance differential cross section Bethe surface 

分 类 号：O562.5[理学—原子与分子物理]