K-shell ionization of atoms by electron and positron impact

Authors

S. P. Khare, Wayne State University
Vandana Saksena, Meerut University, Meerut, India
J. M. Wadehra, Wayne State UniversityFollow

Document Type

Article

Abstract

In the plane-wave Born approximation (PWBA), scaling relations for K-shell generalized oscillator strengths and energy-loss cross sections of atoms are given. The total K-shell ionization cross sections, obtained at high impact energy, are used to obtain the Bethe collisional parameter c_K for atoms ranging from carbon to gold. These values of c_K are, in general, significantly different from those obtained previously with the help of Fano plots at relatively low impact energies. Furthermore, using Hippler’s modification of the PWBA [Phys. Lett. A 144, 81 (1990)], total K-shell ionization cross sections of various atoms by electron and positron impact are calculated over a wide energy range. The electron-impact ionization cross sections for light atoms are in satisfactory agreement with the experimental data.

Disciplines

Physics

Recommended Citation

Khare SP, Saksena V, Wadehra JM. K-shell ionization of atoms by electron and positron impact. Phys. Rev. A. 1993;48(2):1209-13. doi: 10.1103/physreva.48.1209