L-shell ionization in Au by O5+-and Ni5+-ion impact

Abstract

TheL X-ray production cross sections in gold by 60 to 72 MeV O5+ ions and 58 to 87 MeV Ni5+-ions have been measured. TheL-subshell ionization cross sections derived from these experimental results have been compared with the direct ionization theories viz. plane wave Born approximation (PWBA) theory and modified perturbed-stationary-state theory with energy loss, Coulomb deflection and relativistic effects (MECPSSR). A new procedure has been described to account for the change in the yield ratioLβ1/Lβ2, 15 with energy, for Ni5+-ion impact on gold. TheL sub-shell ionization cross sections have been derived fromLβ1,Lβ4 andLβ2, 15 lines of theLβ group in addition to those calculated by the conventional Datz TRY3 technique usingLα,Lγ1 andLγ2, 3 X-ray lines. From the shift in the energies of variousL X-ray lines and changes in their intensities, 3 and 5 spectator vacancies in theM- andN-shells in gold have been estimated with O5+-ion impact while 7, 20 and 4 to 6 spectator vacancies have been inferred in theM-,N-andO-shells respectively with Ni5+-ion impact in the energy range of the projectiles undertaken in the present studies.