Parts | Days | Selection | Search | Downloads | Help
A: Fachverband Atomphysik
A 35: Precision Spectroscopy of Atoms and Ions VI
A 35.6: Talk
Friday, March 6, 2009, 12:15–12:30, VMP 6 HS-B
Relativistic theory of trielectronic recombination with K-shell excitation — •Octavian Postavaru, Christian Beilmann, Christoph H. Keitel, Joachim Ullrich, José R. Crespo López-Urrutia, and Zoltan Harman — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg
In the dielectronic recombination (DR) process involving two interacting electrons, the kinetic energy of the recombined electron is transferred to a single bound electron by excitation to an intermediate autoionizing state. Beyond the simple DR, resonant recombination processes involving higher-order correlations may also occur. Two bound electrons can be simultaneously excited in trielectronic recombination (TR). We performed calculations of cross sections for TR with excitation of a K-shell electron in the framework of the multiconfiguration Dirac-Fock (MCDF) method. Our theoretical predictions have been verified by recent high-resolution emission spectroscopy experiments at the Heidelberg electron beam ion trap [1]. For Kr30+, TR contributions of nearly 6% to the total resonant photorecombination rate were found. This effect has to be considered in the quantitative modelling of fusion and other hot, e. g., astrophysical plasmas.
[1] C. Beilmann, O. Postavaru, R. Ginzel, et al., submitted (2008)