<i>L</i>-subshell ionization cross sections in gold and bismuth by 3.6–9.5-MeV carbon and 4.0–7.2-MeV oxygen ions

Abstract

L-subshell ionization cross sections of Au and Bi induced by ${\mathrm{C}}^{2,3+}$ and ${\mathrm{O}}^{3+}$ ions have been measured for impact energies ranging from 0.25 to 0.79 MeV/u. The data have been compared with the predictions of the ECPSSR [perturbed-stationary-state (PSS) theory with energy-loss (E), Coulomb deflection (C), and relativistic corrections (R)] theory. Reasonable agreement between theory and experiment is observed for the ${\mathit{L}}_{1}$(2${\mathit{s}}_{1/2}$) and ${\mathit{L}}_{3}$(2${\mathit{p}}_{3/2}$) subshells. For the ${\mathit{L}}_{2}$(2${\mathit{p}}_{1/2}$) subshell, however, large disagreement between the data and the ECPSSR predictions persists. This difference could be due to the ``collision-induced intrashell'' mechanism that was suggested by Sarkadi and Mukoyama [J. Phys. B 14, L255 (1981)].