Université de Fribourg

Subshell-selective x-ray studies of radiative recombination of ${\mathrm{U}}^{92+}$ ions with electrons for very low relative energies

Banaś, D. ; Pajek, M. ; Surzhykov, A. ; Stöhlker, Th. ; Brandau, C. ; Gumberidze, A. ; Kozhuharov, C. ; Beyer, H. F. ; Böhm, S. ; Bosch, F. ; Czarnota, M. ; Chatterjee, S. ; Dousse, Jean-Claude ; Fritzsche, S. ; Hagmann, S. ; Liesen, D. ; Mokler, P. H. ; Müller, A. ; Kumar, A. ; Reuschl, R. ; Sierpowski, D. ; Spillmann, U. ; Szlachetko, Jakub ; Tashenov, S. ; Trotsenko, S. ; Verma, P. ; Warczak, A.

In: Physical Review A, 2015, vol. 92, no. 3, p. 032710

Radiative recombination (RR) into the K shell and L subshells of U92+ ions interacting with cooling electrons has been studied in an x-ray RR experiment at the electron cooler of the Experimental Storage Ring at GSI. The measured radiative recombination rate coefficients for electron-ion relative energies in the range 0–1000 meV demonstrate the importance of relativistic effects. The...

Université de Fribourg

Satellite and hypersatellite structures of Lα1,2 and Lβ1 x-ray transitions in mid-Z atoms multiply ionized by fast oxygen ions

Czarnota, M. ; Banaś, D. ; Berset, Michel ; Chmielewska, D. ; Dousse, Jean-Claude ; Hoszowska, Joanna ; Maillard, Yves-Patrick ; Mauron, Olivier ; Pajek, M. ; Polasik, M. ; Raboud, Pierre-Alexandre ; Rzadkiewicz, J. ; Słabkowska, K. ; Sujkowski, Z.

In: Physical Review A, 2014, vol. 88, no. 5, p. 052505

A detailed investigation of the Lα1,2 (L3→M4,5) and Lβ1 (L2→M4) x-ray satellite and hypersatellite structures in zirconium, molybdenum, and palladium atoms multiply ionized by impact with 278.6-MeV oxygen ions is reported. The x-ray spectra were measured with a high-resolution von Hamos bent crystal spectrometer. For the interpretation of the complex spectral features, relativistic...

Université de Fribourg

Enhanced radiative recombination of U⁹²⁺ ions with cooling electrons for the K-shell

Banaś, D. ; Beyer, H .F. ; Bosch, F. ; Brandau, C. ; Böhm, S. ; Chatterjee, S. ; Czarnota, M. ; Dousse, Jean-Claude ; Gumberidze, A. ; Hagmann, S. ; Kozhuharov, C. ; Liesen, D. ; Mokler, P. H. ; Müller, A. ; Kumar, A. ; Pajek, M. ; Reuschl, R. ; Schmidt, E. W. ; Sierpowski, D. ; Spillmann, U. ; Surzhykov, A. ; Stöhlker, Th. ; Szlachetko, Jakub ; Tashenov, S. ; Trotsenko, S. ; Verma, P. ; Warczak, A.

In: Journal of Physics: Conference Series, 2012, vol. 388, no. 6, p. 062044

Observed enhancement of K-shell radiative recombination (RR) of bare uranium ions with cooling electrons is interpreted in terms of of distant transverse collisions in magnetized electron-cooler plasma described within the semiclassical geometrical model (SGM), which was recently proposed. The Monte Carlo simulations based on the proposed approach explains the enhancement measured in RR of...

Université de Fribourg

Observation of internal structure of the L-shell x-ray hypersatellites for palladium atoms multiply ionized by fast oxygen ions

Czarnota, M. ; Banaś, D. ; Berset, Michel ; Chmielewska, D. ; Dousse, Jean-Claude ; Hoszowska, Joanna ; Maillard, Yves-Patrick ; Mauron, Olivier ; Pajek, M. ; Polasik, M. ; Raboud, Pierre-Alexandre ; Rzadkiewicz, J. ; Słabkowska, K. ; Sujkowski, Z.

In: Physical Review A, 2010, vol. 91, no. 06, p. 064702

An observation of the internal structure of the L-shell hypersatellite x rays resulting from the one-photon decay of L⁻² double-vacancy states in palladium multiply ionized by oxygen ions is reported. The Pd L₃→M4,5 x-ray spectrum was measured with a von Hamos high-resolution crystal spectrometer. The complex shape of the observed spectrum could be interpreted in detail using...

Université de Fribourg

High-resolution X-ray study of the multiple ionization of Pd atoms by fast oxygen ions

Czarnota, M. ; Banaś, D. ; Berset, Michel ; Chmielewska, D. ; Dousse, Jean-Claude ; Hoszowska, Joanna ; Maillard, Yves-Patrick ; Mauron, Olivier ; Pajek, M. ; Polasik, M. ; Raboud, Pierre-Alexandre ; Rzadkiewicz, J. ; Słabkowska, K. ; Sujkowski, Z.

In: The European Physical Journal D, 2010, p. -

The multiple ionization of the L- and M-shells of Pd by fast oxygen ions has been studied by measuring with high-resolution the satellite structures of the Lα1,2 X-ray transitions. Relativistic multi-configuration Dirac-Fock (MCDF) calculations were used to interpret the complex X-ray spectrum, allowing to derive the number of L- and M-shell spectator vacancies at the moment of the...

Université de Fribourg

The satellites and hypersatellites of Lα1 2 and Lβ1 x-ray transitions in zirconium excited by oxygen and neon ions

Czarnota, M. ; Pajek, M. ; Banaś, D. ; Dousse, Jean-Claude ; Berset, Michel ; Mauron, Olivier ; Maillard, Yves-Patrick ; Raboud, Pierre-Alexandre ; Hoszowska, Joanna ; Polasik, M. ; Słabkowska, K. ; Chmielewska, D. ; Rzadkiewicz, J. ; Sujkowski, Z.

In: Journal of Physics: Conference Series, 2009, vol. 194, p. 152012

The interpretation of L-shell satellites and hypersatellites for Lα1,2 (L₃→M4,5) and Lβ₁ (L₂→M₄) x-ray transitions in zirconium multiply ionized by oxygen and neon ions is reported. The x-ray spectra were measured with a high-resolution von Hamos spectrometer and interpreted in terms the relativistic...

Université de Fribourg

The enhancement effect in K-shell radiative recombination of U⁹²⁺ ions with cooling electrons

Banaś, D. ; Pajek, M. ; Stöhlker, Th. ; Beyer, H. F. ; Böhm, S. ; Bosch, F. ; Brandau, C. ; Czarnota, M. ; Chatterjee, S. ; Dousse, Jean-Claude ; Fritzsche, S. ; Gumberidze, A. ; Hagmann, S. ; Kozhuharov, C. ; Kumar, A. ; Liesen, D. ; Mokler, P. H. ; Müller, A. ; Reuschl, R. ; Schmidt, E. W. ; Sierpowski, D. ; Spillmann, U. ; Surzhykov, A. ; Szlachetko, Jakub ; Tashenov, S. ; Trotsenko, S. ; Verma, P. ; Warczak, A.

In: The European Physical Journal: Special Topics, 2009, vol. 169, no. 1, p. 15-18

We report the results of the x-ray radiative recombination (RR) experiment at the electron cooler of the ESR storage ring performed, for the first time, for detuned (off- cooling) electron energies. In this experiment the recombination of stored, decelerated bare uranium ions with electrons in the energy range 0–1000 meV was studied by observing K-RR x-ray photons emitted from direct...

Université de Fribourg

Vacancy rearrangement processes in multiply ionized atoms

Czarnota, M. ; Pajek, M. ; Banas, D. ; Dousse, Jean-Claude ; Maillard, Yves-Patrick ; Mauron, Olivier ; Raboud, Pierre-Alexandre ; Berset, Michel ; Hoszowska, Joanna ; Slabkowska, K. ; Polasik, M. ; Chmielewska, D. ; Rzadkiewicz, J. ; Sujkowski, Z.

In: Journal of Physics: Conference Series, 2007, vol. 58, no. 1, p. 295

We demonstrate that in order to interpret the x-ray satellite structure of Pd Lα1,2(L₃M4,5) transitions excited by fast O ions, which was measured using a high-resolution von Hamos crystal spectrometer, the vacancy rearrangement processes, taking place prior to the x-ray emission, have to be taken into account. The measured spectra were compared with the predictions...