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Charge state effect on K-shell ionization of silicon induced by iodineq+ ions

  • Yu Lei
  • Rui Cheng
  • Xianming Zhou
  • Xing Wang
  • Yuyu Wang
  • Jieru Ren
  • Yongtao Zhao
  • Xinwen Ma
  • Guoqing Xiao
Regular Article

Abstract

In near Bohr velocity ion-atom collisions, a dependence of target K-shell ionization cross sections upon the ionic charge states has been observed. Experiments were performed in silicon solid target with 2–5 MeV iodineq+ ions incident in charge states +20 to +25. K-shell ionization cross section of silicon for q = 20 and 22 iodine ions impact with the same incident energy are almost equal, and are well described by the theory of binding-energy-modified BEA. However, for q = 25 iodine ions collisions, 3d vacancies of projectile transfer to the 1s orbit of target atom via rotational coupling of 3, δ-3 molecular orbits in the framework of quasi-molecular model, which results in an increase of the K-shell ionization cross section of silicon.

Graphical abstract

Keywords

Atomic and Molecular Collisions 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Modern Physics, Chinese Academy of SciencesLanzhouP.R. China
  2. 2.University of Chinese Academy of ScienceBeijingP.R. China
  3. 3.School of Science, Xi’an Jiaotong UniversityXi’anP.R. China

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