L3-SHELL IONIZATION OF XENON AND GOLD BY ELECTRON AND POSITRON IMPACTS

The plane wave Born approximation with Coulomb, relativistic and excha nge corrections is employed to obtain L3-shell ionization cross sectio ns of xenon and gold bombarded by electrons and positrons in the energ y range varying from the threshold of ionization to 100 keV. For low i ncident energies the present electron impact cross sections are in ver y good agreement with the available experimental data for both the tar gets. For positron impact the agreement between the present results an d the limited experimental data is also satisfactory. Near the thresho ld the calculated electron impact cross sections for both the targets can be represented by a power law over an extended energy region. The value of the power index n agrees with the available experimental valu e.