Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 41: Poster: Electron scattering and recombination
A 41.9: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Unexpected high strength of inter-shell trielectronic recombination — C. Beilmann1, P.H. Mokler1, T.M. Baumann1, S. Bernitt1, C.H. Keitel1, J. Ullrich1, Z. Harman1,2, and •J.R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2ExtreMe Matter Institute (EMMI), Darmnstadt, Germany
Intershell KL-LLL trielectronic recombination (TR) in highly charged ions, where a K-shell and a L-shell electron are simultaneously excited by the capture of a free one, was studied at electron beam ion traps. In our experiments and accompanying MCDF calculations, we show that these higher-order contributions to the total recombination yield grow to an unexpected strength in light and mid-heavy ions. The experimental results of TR measurements in Ar, Fe and Kr allow for the deduction of a scaling law for the TR strength in dependence of Z. In C-like ions with Z ≤ 20, TR even dominates over the first-order dielectronic process (DR) [1]. The strong sensitivity of the TR process to eletron-electron interaction gives new experimental access to the study of inner-atomic electron correlation effects. Therefore, the importance of Breit interaction becomes measurable already for lighter ions around Fe (Z=26) focussing on TR resonances. Beside this, considering the strong selection rules for TR, the measurements can be used as a proof for the importance of configuration interaction. We present theoretical considerations using the flexible atomic code as well as experimental investigations of C-like TR in iron.
[1] C. Beilmann et al., Phys. Rev. Lett. 107, 143201 (2011)