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

Hoszowska, Joanna; Dousse, Jean-Claude; Cao, Wei; Fennane, Karima; Kayser, Yves; Szlachetko, Monika; Szlachetko, Jakub; Kavčič, Matjaz

doi:10.1103/PhysRevA.82.063408

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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

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 et de médecine

Department

Département de Physique

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