Hamburg 2009 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 34: Poster II
A 34.19: Poster
Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster
Angle-resolved hypersatellite emission following the dielectronic recombination of heavy ions — •Stephan Fritzsche1,2, Nicolai Kabachnik3, Thomas Stoehlker2,4, and Andrey Surzhykov2,4 — 1Frankfurt Institute for Advanced Studies — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Moscow State University — 4Universität Heidelberg
Dielectronic recombination (DR) is an important process in plasmas that leads to the radiative stabilization of muliple and highly-charged ions. At GSI Darmstadt, for example, the K − L L dielectronic recombination of (finally) helium–like uranium U90+ ions has been studied in detail [1], along with its subsequent photon emission. However, while the measured cross sections are quite well understood already within an independent–particle model, a remarkable discrepancy was found for the angular distribution of the Kα1 hypersatellite radiation following the K − L1/2 L3/2 resonant electron capture [1,2].
In this work, the density matrix theory has been applied to
re–investi-gate the DR of (initially) hydrogen–like ions with regard to the
non–dipole contributions of the relativistic electron–photon
interaction. In particular, it is shown how the angular distribution of the
Kα1,2 hypersatellite lines is notably influenced by the
interference between the leading electric–dipole E1 and — the much
weaker — magnetic–quadrupole M2 decay channels [3].
X. Ma et al, Phys. Rev. A 68 (2003) 042712.
S. Zakowicz et al, Phys. Rev. A 68 (2003) 042711.
S. Fritzsche et al., Phys. Rev. A 78 (2008) 032703.