Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 8: Poster I
A 8.31: Poster
Dienstag, 9. März 2010, 16:30–19:00, Lichthof
Resonant electron-ion photorecombination processes of higher order — •Christian Beilmann1, Octavian Postavaru1, Lodewijk Arntzen1, Rainer Ginzel1, Christoph H. Keitel1, Volkhard Mäckel1, Paul H. Mokler1, Martin C. Simon1, Hiro Tawara1, Joachim Ullrich1, José R. Crespo López-Urrutia1, and Zoltán Harman1,2 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2ExtreMe Matter Institute (EMMI), Darmstadt, Germany
Dielectronic recombination (DR), the fundamental process where a free electron is captured by the potential of a highly charged ion and its kinetic energy is transfered to a bound electron, has been intensively investigated due to its interest for fundamental atomic physics and the diagnostic of astrophysical and earthbound plasmas. Besides DR, there are resonant photorecombination processes of higher order. In these, two or three bound electrons can be simultaneously excited by the captured electron in the so-called trielectronic (TR) or quadruelectronic (QR) recombination. Measurements of TR are very scarce and the first observations of TR involved only low energy excitation of the L-shell. We present the first observation of TR with K-shell excitation as well as signatures of QR obtained by high electron energy resolution recombination measurements in an electron beam ion trap (EBIT) [1]. Investigations of Ar, Fe and Kr allow for Z dependency studies of TR cross sections, and show large, and even dominant contributions of this process to the total resonant photorecombination cross section.
[1] C. Beilmann, O. Postavaru, et al., PRA 80, 050702(R) (2009)