Electron-impact excitation of FeII

被引:1
作者
Ramsbottom, C. A. [1 ]
Noble, C. J. [2 ]
Burke, V. M. [2 ]
Scott, M. P. [1 ]
Burke, P. G. [1 ]
机构
[1] Queens Univ Belfast, Dept Appl Math & Theoret Phys, Belfast BT7 1NN, Antrim, North Ireland
[2] CSE Dept, CLRC Daresbury Lasb, Warrington WA4 4AD, Cheshire, England
来源
HCI 2006: 13TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF HIGHLY CHARGED IONS | 2007年 / 58卷
关键词
D O I
10.1088/1742-6596/58/1/062
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report in this paper the computation of accurate total collision strengths and effective collision strengths for electron-impact excitation of FeII, using the parallel R-matrix program PRMAT. Target states corresponding to the 3d(6)4s, 3d(7), 3d(6)4p and 3d(5)4s4s basis configurations were included in the calculations giving rise to a 113 LS state 354 coupled channel problem. Following a detailed systematic study of correlation effects in both the target state and collision wavefunctions, it was found that an additional 21 configuration functions needed to be included in the Configuration Interaction expansion to obtain significantly more accurate target states and collision wavefunctions. This much improved 26-configuration model has been used to calculate converged total effective collision strengths for all sextet to quartet transitions among these levels with total spin S=2, giving a total of 1785 lines. These calculations have laid the foundation for an approach which may be adopted in the study of electron collisions with the low ionization stages of other iron peak elements. The work has been further extended with the commencement of a Breit-Pauli relativistic calculation for one of the smaller models and includes 262 fine-structure levels and over 1800 coupled channels. At the same time the PRMAT parallel R-matrix package is being extended to include relativistic effects which will allow us to attempt the more sophisticated 26-configuration model and produce for the first time the amount and quality of atomic data required to perform a meaningful synthesis of the Fe II spectrum.
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页码:283 / +
页数:2
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