Journal article

Double K-shell photoionization and hypersatellite x-ray transitions of 12⩽Z⩽23 atoms

  • Hoszowska, Joanna Department of Physics, University of Fribourg, Fribourg, Switzerland
  • Dousse, Jean-Claude Department of Physics, University of Fribourg, Fribourg, Switzerland
  • Cao, Wei Department of Physics, University of Fribourg, Fribourg, Switzerland
  • Fennane, Karima Department of Physics, University of Fribourg, Fribourg, Switzerland
  • Kayser, Yves Department of Physics, University of Fribourg, Fribourg, Switzerland
  • Szlachetko, Monika Department of Physics, University of Fribourg, Fribourg, Switzerland
  • Szlachetko, Jakub European Synchrotron Radiation Facility (ESRF),Grenoble, France
  • Kavčič, Matjaz J. Stefan Institute, Ljubljana, Slovenia
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    16.12.2010
Published in:
  • Physical Review A. - 2010, vol. 82, no. 6, p. 063408
English Single-photon double K-shell ionization of low-Z neutral atoms in the range 12⩽Z⩽23 is investigated. The experimental method was based on measurements of the high- resolution Kαh hypersatellite x-ray spectra following the radiative decay of the K-shell double-vacancy states excited by monochromatic synchrotron radiation. The photon energy dependence of the double K-shell ionization was measured over a wide range of photon energies from threshold up to and beyond the maximum of the double-to- single photoionization cross section ratios. From the high-resolution x-ray emission spectra the energies and linewidths of the hypersatellite transitions, as well as the Kαh1:Kαh2 intensity ratios, were determined. The relative importance of the initial-state and final-state electron-electron interactions to the K-shell double photoionization is addressed. Physical mechanisms and scaling laws of the K-shell double photoionization are examined. A semiempirical universal scaling of the double- photoionization cross sections with the effective nuclear charge for neutral atoms in the range 2⩽Z⩽47 is established.
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/305070
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