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Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 22: Electron scattering and recombination I

A 22.4: Vortrag

Donnerstag, 17. März 2011, 15:00–15:15, BAR 106

Electron impact excitation of highly-charged ions — •Lalita Sharma1,2, Andrey Surzhykov1,2, Rajesh Srivastava3, and Stephan Fritzsche2,41Physikalisches Institut der Universität Heidelberg — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Indian Institute of Technology Roorkee, India — 4Department of Physical Sciences, University of Oulu, Finland

During the last decade, electron impact excitation of few–electron ions has been explored intensively both at electron beam ion traps (EBIT) and ion storage ring facilities. In these studies, particular attention has been paid to the linear polarization of the subsequent characteristic photon emission. Such a (fluorescence) polarization can be used as a precise tool for the plasma diagnostic as well as for better understanding of the relativistic and many–body effects in electron-ion collisions. In this contribution, a fully–relativistic distorted–wave code was developed by us recently, and has been employed to investigate electron impact excitation of highly charged ions. Detailed calculations have been performed, in particular, for the KL excitation of hydrogen–like Ar17+, Ti21+ and Fe25+ ions for a wide range of collision energies. Apart from the total cross sections theoretical predictions were obtained for the alignment parameters of the excited ionic states and, hence, for the polarization of the characteristic Lyman–α lines. Results of our calculations are compared with the available experimental and theoretical data.

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