Sp. Khare et Jm. Wadehra, K-SHELL, L-SHELL, AND M-SHELL IONIZATION OF ATOMS BY ELECTRON AND POSITRON-IMPACT, Canadian journal of physics, 74(7-8), 1996, pp. 376-383
The plane-wave Born approximation with Coulomb, relativistic, and exch
ange corrections is employed to obtain the K-, L1-, L2-, L3-, and M-sh
ell ionization cross sections of a number of atoms bombarded by electr
ons and positrons in the energy range varying from the threshold of io
nization to 1 GeV. Transverse interaction of virtual photons with atom
s is also included and it is found to be of great significance for imp
act energies greater than about 1 MeV. For K- and L-shell ionization,
good agreement between the theoretical values and various experimental
data for electron-impact cross sections is obtained. However, for the
M shell, the theory overestimates the experimental cross sections. Fo
r positron impact the agreement between the present results and the li
mited experimental data is found to be quite satisfactory.