M-subshell x-ray production cross sections of Au induced by highly charged F, C, and Li ions and protons:: A large enhancement in the M3 fluorescence yield -: art. no. 062709

M-subshell x-ray production cross sections are measured for Au, induced by F. ions in the energy range of 20 to 102 MeV. For a comparative study the measurements ate also carried. out for protons, He, Li, C ions at a few energies. We have derived the absolute cross sections for M alphabeta and Mtheta x rays as well as the total M x-ray cross sections. The intensity ratios, I(gamma)/I(alphabeta), of the M(gamma) and M(alphabeta), as well as the energy shifts of these lines signifying multiple vacancies in outer shells have also been studied as a function of projectile atomic number. The measured cross sections are compared with available theoretical calculations, namely, the ECPSSR based on the perturbed stationary state (PSS) approximation including the-effects due to the increased binding energy, Coulomb deflection (C), energy loss (E), and relativistic (R) wave function. In case of the M gamma the measured cross sections are much higher compared to the ECPSSR. prediction which is attributed to a dramatic enhancement in the M-3-subshell fluorescence yield owing to multiple vacancies in N subshells. The enhancement strongly depends on the projectile atomic number.