EGAS41 - Swansea University

41 st EGAS CP 135 Gdańsk 2009
Structure of satellites and hypersatellites of Lα 1,2 and Lβ 1 lines
in mid-Z atoms excited by oxygen ions
M. Czarnota 1,∗ , M. Pajek 1 , D. Banaś 1 , M. Polasik 2 , K. S̷labkowska 2 , J.-Cl. Dousse 3 ,
Y.-P. Maillard 3 , O. Mauron 3 , M. Berset 3 , P.-A. Raboud 3 , J. Hoszowska 3 ,
D. Chmielewska 4 , J. Rzadkiewicz 4 , Z. Sujkowski 4
1 Institute of Physics, Jan Kochanowski University, 25-406 Kielce, Poland
2 Faculty of Chemistry, Nicholas Copernicus University, 87-100 Toruń, Poland
3 Physics Department, University of Fribourg, CH-1700 Fribourg, Switzerland
4 Soltan Institute for Nuclear Studies, 05-400 Otwock-Świerk, Poland
∗ Corresponding author: M.Czarnota@ujk.kielce.pl,
The L-shell satellites and hypersatellites of Lα 1,2 (L 3 →M 4,5 ) and satellites of Lβ 1 (L 2 →M 4 )
x-rays transitions in zirconium, molybdenum and palladium excited by oxygen ions were
measured. The measurements were performed in the Paul Scherrer Institute (PSI) in Villigen,
Switzerland. The experiment was performed using the ion beam from the ECR ion
source. The oxygen ions with energy 278.6 MeV were accelerated by the Philips cyclotron
and transported to the crystal von Hamos spectrometer [1]. The von Hamos spectrometer
is a high-resolution diffraction spectrometer having an instrumental energy resolution of
about 0.3 ÷ 0.6 eV for studied x-rays. The absolute energy calibration of the spectrometer
was about 0.3 eV [2]. In order to interpret the observed satellites and hypersatellites
structures the relativistic MCDF calculations [3] were performed for multi-vacancy configurations
expected to be excited in collisions with oxygen ions. In the presented work we
report the experimentally determined hypersatellite to satellite ratio R for L−shell and
the ionization probability p M for the M−shell. These results are compared with the theoretical
predictions of the SCA approximation using the relativistic, hydrogenic-like wave
functions (HYD) and the relativistic, selfconsistent Dirac-Hartree-Fock wave functions
(DHF).
To our knowledge, this is the first experimental observation of a direct excitation of
the L-shell hypersatellites in ion-atom collisions, which is, additionally, clearly interpreted
by a complex MCDF calculations revealing their internal structure corresponding to the
multi-vacancy (L −2 N −n M −m ) configurations. Analysis clearly demonstrates the satellite
(L −1 M −m N −n ) and hypersatellite (L −2 M −m N −n ) transitions correspond to the excited
multi-vacancy initial configurations. The relative intensities of x-ray satellites indicate
the importance of the relativistic, self-consistent description of electrons in the L-, and
M-shells.
References
[1] J. Hoszowska et al., Nucl. Instr. and Meth. A 376, 129 (1996)
[2] M. Czarnota et al., Nucl. Instr. and Meth. B 205, 133 (2003)
[3] M. Polasik, Phys. Rev. A 52, 227 (1995)
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