Ionization of iridium ions in the Dresden EBIT studied by X-ray spectroscopy of direct excitation and radiative recombination processes |
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| Authors: | U Kentsch T Werner G Zschornack F Grossmann VP Ovsyannikov F Ullmann |
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| Institution: | Technische Universit?t Dresden, Institut für Kern- und Teilchenphysik, Mommsenstr. 13, 01069 Dresden, Germany, DE
Leybold Vakuum Dresden GmbH, Zur Wetterwarte 50, 01109 Dresden, Germany, DE
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| Abstract: | Irq+ ( 41≤q≤64) ions with open-shell configurations have been produced in the electron beam of the room-temperature Dresden Electron
Beam Ion Trap (Dresden EBIT) at electron excitation energies from 2 keV to 13 keV. X-ray emission from direct excitation processes
and radiative capture in krypton-like to aluminium-like iridium ions is measured with an energy dispersive Si(Li) detector.
The detected X-ray lines are analyzed and compared with results from multiconfigurational Dirac-Fock (MCDF) atomic structure
calculations. This allows to determine dominant produced ion charge states at different electron energies. The analysis shows
that at the realized working gas pressure of 5×10-9mbar for higher charged ions the maximum ion charge state is not preferently determined by the chosen electron beam energy
needed for ionization of certain atomic substates, but by the balance between ionization and charge state reducing processes
as charge exchange and radiative recombination. This behaviour is also discussed on the basis of model calculations for the
resulting ion charge state distribution.
Received 12 July 2001 and Received in final form 10 September 2001 |
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| Keywords: | PACS 32 30 Rj X-ray spectra – 78 70 En X-ray emission spectra and fluorescence – 29 25 Ni Ion sources: positive and negative |
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