Hannover 2010 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 2: Diagnostics

P 2.14: Fachvortrag

Montag, 8. März 2010, 17:45–18:10, B 305

Trielectronic recombination in highly charged ions — •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 Harman1,21Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2ExtreMe Matter Institute (EMMI), Darmstadt, Germany

The fundamental process of dielectronic recombination (DR) has, beside its relevance for the investigation of the atomic structure, a wealth of applications in plasma diagnostics. In DR, a free electron is captured by the potential of a highly charged ion and its energy is transferred to a bound electron that is excited by that, followed by radiative deexitation. For plasma diagnosics, DR processes with K-shell excitation of midweight elements are in the focus of interest. Deexcitation of the K-shell by X-ray photon emission is an important plasma cooling mechanism in these cases, since the emitted photons carry away the kinetic energy of the captured electron.

Besides DR there are resonant recombination processes of higher order with the simultaneous excitation of two electrons, the so called trielectronic recombination (TR). Its significant contributions to the total recombination rates makes it necessary to consider these processes in calculations of cooling rates. We present the first measurements of TR with K-shell excitation [1] of Kr, Fe and Ar, carried out in an EBIT, and discuss the TR contributions in dependency of the atomic number.

[1] C. Beilmann, O. Postavaru, et al., PRA 80, 050702(R) (2009)

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