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arXiv 1306.1029physics.atom-ph
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多电子K-L壳层间共振复合过程在Ar、Fe和Kr类Li到O离子中的主要作用

Major role of multielectronic K-L inter-shell resonant recombination processes in Li- to O-like ions of Ar, Fe, and Kr

C. Beilmann, Z. Harman, P. H. Mokler, S. Bernitt, C. H. Keitel, J. Ullrich, J. R. Crespo López-Urrutia

摘要:

双电子和高阶共振电子复合过程,包括K-壳层激发系统地测量在高分辨率的电子束离子阱。研究了高电荷态Ar、Fe和Kr离子的复合总截面随原子序数Z的变化规律,并与理论计算结果进行了比较。发现大的高阶共振复合贡献,特别是对于10<Z<36的系统。在某些情况下,它们甚至超过了双电子通道的强度,迄今为止,双电子通道一直被认为是占主导地位的。这些发现对高温等离子体的建模具有重要意义。还观察到归因于壳层间四电子复合的特征。的实验数据得到的He类O类等电子序列比较先进的相对论扭曲波计算采用多组态Dirac-Fock束缚态波函数,包括三重和四重激发的结果。

英文摘要:

Dielectronic and higher-order resonant electron recombination processes including a K-shell excitation were systematically measured at high resolution in electron beam ion traps. Storing highly charged Ar, Fe, and Kr ions, the dependence on atomic number Z of the contribution of these processes to the total recombination cross section was studied and compared with theoretical calculations. Large higher-order resonant recombination contributions are found, especially for systems with 10<Z<36. In some cases, they even surpass the strength of the dielectronic channel, which was hitherto presumed to be always the dominant one. These findings have consequences for the modeling of high-temperatur plasmas. Features attributed to inter-shell quadruelectronic recombination were also observed. The experimental data obtained for the He-like to O-like isoelectronic sequences compare well with the results of advanced relativistic distorted-wave calculations employing multiconfiguration Dirac-Fock bound state wave functions that include threefold and fourfold excitations.

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