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(e, 2e) Investigations of the Simultaneous Ionization and Excitation of Helium to He+(n=2) (cited: 1)
Shi-yan Sun,Xiang-fu Jia*
Author NameAffiliationE-mail
Shi-yan Sun Centure for research of Molecule Science, School of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China  
Xiang-fu Jia* Centure for research of Molecule Science, School of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China jiaxf@sxnu.dns.edu.cn 
Abstract:
Three-Coulomb-wave method is employed to treat the process of (e, 2e) simultaneous ion-ization and excitation to the n=2 state of helium, with radial and angular correlated wave-function of He target. The triple differential cross sections are calculated and analyzed in very asymmetric coplanar geometry at incident energies of 5.50, 1.50 and 0.57 keV. Results are compared with the absolute measurements and the theoretical first and second Born approximation. The present triply differential cross section (TDCS) is found to be in good agreement with experimental data qualitatively. The distinguishing feature noted in TDCS structure is the presence of intense recoil peak that for certain parameters is even larger than the binary peak, an unusual feature for the single-ionization process at high and intermediate energies.
Key words:  Excitation-ionization, Three-Coulomb-wave model, Triply differential cross section
FundProject:
电子碰撞He电离激发过程(e+He(1s2)→2e+He+(n=2))的理论研究 (cited: 1)
孙世艳,贾祥富*
摘要:
考虑He靶原子具有径向及角度关联的初态波函数,应用三体库仑模型(简称3C)研究电子碰撞He原子电离激发过程,并进行理论推导,按照实验要求计算和分析了在共面不对称几何条件下,能量分别为5.50、1.50和0.570 keV的入射电子碰撞He原子电离激发的三重微分截面(TDCS),并将其计算结果与绝对实验数据及其它理论结果进行了比较. 计算结果表明,BBK模型能够定性地描述这样的反应过程,且能反映实验数据中TDCS呈现出一强的recoil峰,对于某些能量和散射角,其recoil峰甚至高于binary峰,这与中高能单电离过程是完全不相同的.
关键词:  电离激发,三体库仑模型,三重微分截面
DOI:10.1063/1674-0068/26/05/576-579
分类号: