Investigations of the dielectronic recombination of phosphorus-like tin at CSRm

The electron–ion recombination for phosphorus-like~(112) Sn~(35+)has been measured at the main cooler storage ring of the Heavy Ion Research Facility in Lanzhou, China, employing an electron–ion merged-beams technique. The absolute total recombination rate coefficients for electron–ion collision energies from 0 e V–14 e V are presented. Theoretical calculations of recombination rate coefficients were performed using the Flexible Atomic Code to compare with the experimental results. The contributions of dielectronic recombination and trielectronic recombination on the experimental rate coefficients have been identified with the help of the theoretical calculation. The present results show that the trielectronic recombination has a substantial contribution to the measured electron–ion recombination spectrum of~(112)Sn~(35+). Although a reasonable agreement is found between the experimental and theoretical results the precise calculation of the electron–ion recombination rate coefficients for M-shell ions is still challengeable for the current theory.     

类Li等电子系离子共振俘获双自电离截面的扭曲波计算

利用扭曲波玻恩交换（DWBE）近似方法计算了类锂等电子系郭子的共振俘获双自电离（REDA）截面,计算结果同实验和其他理论相一致.还重点研究了组态混合和辐射通道对REDA过程的影响以及REDA在总截面中的贡献大小,并给出了随Z的变化趋势. 关键词：     

一次学生说题比赛的活动纪实与思考

近年来,数学“说题”一词悄悄地流行于教育和教学的诸多方面（如文[1]一文[63）．学生说题是指学生根据审题、分析、解答和回顾总结等思维过程说出自己的认识与感想的一项数学活动．笔者受自身参加教师说题比赛的启发,产生了学生说题的想法,尝试组织了一次学生说题比赛的活动．     

EFFECT OF CONFIGURATION INTERACTION ON EXCITATION AUTOIONIZATION CROSS SECTIONS

The effect of configuration interaction (CI) on the theoretical calculation of autoionization cross section for Li-like ions are studied in detail by employing the distorted wave Born exchange approximation. We consider the 1s²2s→1s2s2p and 1s²2s→1s2s3p transitions for Cs³⁺ and Al¹⁰⁺ ions. These two transitions account for the largest excitation autoionization cross section. It is found that the CI has a significant effect on the calculated results. The effect becomes larger with increasing atomic number.     

电子与Ar的高电荷态离子的碰撞电离

利用扭曲波Born交换近似方法, 系统地计算了Ar的类氢到类钠离子的电子碰撞电离截面和速率系数. 同时使用精度高的拟合公式对直接电离截面、激发截面、总激发自电离截面和速率系数进行了拟合, 以满足实际应用的需要.     

Dielectronic Recombination of Ni-Like Gold Ion Through the Cu-Like 3d^94ln＇l＇ （n＇= 4, 5） Configurations

Ab initio calculations of dielectronic recombination (DR) rate coefficients from the ground state of Ni-like A u ion through the Cu-like 3d^94ln‘l‘ (n‘= 4, 5) configurations have been performed by using a relativistic atomic code FAC with configuration interaction. The DR rate coefficients through the 3d^94l5f5/2 and 3d^94l5f7/2 configurations are evaluated separately. The contributions from resonant and nonresonant radiative stabilizing transitions to the total rate coefficients are distinguished and discussed. The decays to autoionizing levels followed by radiative cascades are included in the calculation.     

类镍钨离子共振激发速率系数

本文利用基于相对论组态混合的扭曲波近似方法,细致研究了类镍钨离子从基态到3l-14l'(l=s,p,d;l'=0-3)各组态共106条单激发态能级,通过类铜双激发态3l174l'n"l"和3l175l'n"l"的电子碰撞共振激发速率系数.本工作的结果与R矩阵计算值相比较存在较大差别.     

Au52+离子的双电子复合速率系数

利用基于相对论组态混合的扭曲波近似方法计算了从类钴金离子的基态3s23p63d9(J=5/2)经过类镍的3l17nl″和3l164l′nl″电子组态的双电子复合速率系数,并考虑了级联辐射到可自电离能级退激的影响,给出了包含级联辐射在内的能级到能级的外推方法.     

类镍钨离子共振激发速率系数

本文利用基于相对论组态混合的扭曲波近似方法，细致研究了类镍钨离子从基态到3l^-14l＇（l=s，p，d；l’=0—3）各组态共106条单激发态能级，通过类铜双激发态3l^174l’n＇l＂和3l^175l’n＂l＂的电子碰撞共振激发速率系数．本工作的结果与R矩阵计算值相比较存在较大差别，     

Resonance Excitation Rate Coefficient of Ni-Like Tantalum

The ab initio calculations of electron-impact resonant excitation rate coefficients from the ground level to 54 fine-structure levels of 3d94l （1 = s, p, d, f） configurations of Ni-like tantalum ion are performed by using a fully relativistic distorted-wave approximation. The configuration-interaction effects are taken into account. The decays to autoionizing levels possibly followed by autoionization cascades are also included in the calculation. The contributions from doubly-excited intermediate states of Cu-like 31^17n′l′n′l″ （n′ = 4, 5; n″ = 5 - 15） are calculated explicitly, and the contributions from high Rydberg states （n″〉 15） are taken into account by using n-3 scaling law. The present results should be more accurate than the existent calculations.