Fe^(24+)离子双电子复合以及和H_2 碰撞的共振转移与激发X射线发射过程的研究  

Study of dielectronic recombination and resonance transfer and excitation with X-ray emission for Fe^(24+)+H_2 collision

作　　者：牟致栋[1] 魏琦瑛[1] 

机构地区：[1]中国矿业大学理学院,徐州221008

出　　处：《物理学报》2014年第8期118-127,共10页Acta Physica Sinica

基　　金：中央高校基本科研业务费(批准号:2013XK04)资助的课题~~

摘　　要：以准相对论Hartree-Fock理论为基础,对Fe^(24+)离子KLn(n=L,M,N,O,P)共振激发态可能辐射衰变通道的双电子复合过程的共振强度进行了系统的理论计算研究,计算了KLL共振激发态谱项能级电偶极允许跃迁的共振强度和截面,在此基础上,根据已有H_2分子的实验Compton轮廓,进一步计算了能量在300—800 MeV范围内,抛射体Fe^(24+)离子俘获H_2分子靶电子的KLn(n=L,M,N,O,P)共振电荷转移与激发X射线发射截面,计算结果与最新实验值或者其他理论计算结果做了对比分析,研究表明,对于Fe^(24+)离子KLn(n=L,M,N,O,P)的双激发态,Kα辐射衰变通道对双电子复合过程的共振强度贡献最大,是起主导性作用的重要通道,Kα辐射衰变X射线的波长范围λ为1.850—1.880A,而非Kα辐射衰变的波长范围λ为1.460—1.601 A,两者共振X射线的波长位置并不重叠。Based on the theory of Hartree-Fock with relativistic correction, the theoretical study is carried out on the resonance strength of dielectronic recombination （DR） of the resonance double-excited states （i.e., KLL, KLM, KLN, KLO, KLP） of Fe24＋. The resonance strength and colliding cross section of KLL are investigated. By using the experimental results of Compton profiles for H2, the resonance transfer and excitation with X-ray emission cross sections during collision between Fe24＋ and target molecule H2 in an energy range of 300-800 MeV are studied. Our results are compared with the recent experimental and theoretical studies. It is found that for the double-excited states of Fe24＋, the Kα decay tunnel is the major decay tunnel, and the wavelengths of X-ray in this process range from 1.850 to 1.880 ？. For other decay tunnels, the wavelengths of decay wave range from 1.460 to 1.601 ？. There is no overlap between the wavelengths for two cases. Our results are in reasonable agreement with the experimental results within an estimated uncertainty.

关 键 词：Fe24+离子 H2分子 共振转移激发 共振电荷转移与激发X射线光子发射截面 

分 类 号：O562[理学—原子与分子物理]