L- and M-subshell ionization cross-sections of heavy atoms by electron and proton impact

Abstract

Inner-shell ionization has many applications related to material analysis. However, full theoretical calculationsin heavy multielectronic atoms are scarce. In this contribution, we assess proton and electron impact L𝑖 andM𝑖-subshell ionization cross-sections of heavy targets (72 ≤ 𝑍 ≤ 83) using two theoretical models. Thesecalculations are based on the Distorted Plane Wave Born Approximation for electron impact and the shellwiselocal plasma approximation for the proton impact, combined with relativistic calculations of these deepsubshells wave functions and binding energies. We analyze the L-shell ionization of W, Au, and Bi and theM-shell of Hf, Ta, W, Re, Os, Pt, Au, Pb, and Bi. Present values are compared with available experimental datafrom the literature, with disparate agreement. The convergence of proton and electron impact cross-sectionsat high-impact velocities is also discussed.