Journal article

Double 1s shell ionization of Si induced in collisions with 1–3-MeV protons

  • Kavčič, Matjaz J. Stefan Institute, Ljubljana, Slovenia - Department of Physics, University of Fribourg, Switzerland
  • Tökési, K. Institute of Nuclear Research of the Hungarian Academy of Science (ATOMKI), Debrecen, Hungary
Published in:
  • Physical Review A. - 2005, vol. 72, no. 6, p. 062704
English The double 1s ionization of Si induced in collisions with protons was studied by measuring the K x-ray emission of a solid Si target ionized by the impact of 1–3-MeV protons. In order to resolve the hypersatellite contributions corresponding to the radiative decay of the double 1s vacancy state, a high-resolution crystal spectrometer was employed yielding sub-eV energy resolution. From the intensity of the measured hypersatellite lines double 1s ionization cross sections for the studied collisions were determined. Experimental values were compared with the theoretical ones obtained within the independent electron framework employing single electron ionization probabilities calculated with the semiclassical approach. This comparison suggests a sequential two step model for the double 1s ionization which was additionally confirmed by four body classical trajectory Monte Carlo calculations.
Faculté des sciences et de médecine
Département de Physique
  • English
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