Ionization of relativistic K-shell electrons by proton bombardment

M. Kamiya, K. Ishii, K. Sera, S. Morita, H. Tawara

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5 Citations (Scopus)


K-shell ionization cross sections for Ho, Au, and U by proton impact have been measured over the incident energy range 1-4 MeV. The measured cross sections are larger than those predicted from the plane-wave Born, semiclassical, and binary-encounter approximations including Coulomb-deflection and binding-energy effects by factors from 2 to 20. However, it is shown that these large disagreements can be well explained by the semiclassical theory using relativistic wave functions for the K-shell electrons. The validity of various approximate estimations of electronic relativistic effects is discussed. Some results on He3-ion impact are also discussed. Ratios of x-ray production cross sections for K2, K1, and K2 lines to that of K1 line are shown as a function of proton energy and the results indicate little simultaneous ionization probability in the L, M, and N shells of heavy atoms.

Original languageEnglish
Pages (from-to)2295-2304
Number of pages10
JournalPhysical Review A
Issue number6
Publication statusPublished - 1977
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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