Projectile charge and energy dependence of titanium K x rays and satellites following excitation by fast heavy ions

High-resolution measurements have been made of Ti Kα x rays and satellites (KLⁿ,n=0-4) following bombardment of thick Ti targets by H⁺, Heⁿ⁺, Liⁿ⁺, Cⁿ⁺, and Oⁿ⁺ ions at energies of 1-5 MeV/amu. A systematic study was made of the effect of projectile atomic number Z₁ and energy E₁ upon the relative intensities, centroid energies, and widths of the various x-ray peaks. The intensity of the satellite structure relative to the diagram lines (Kα₁,α₂) increases with increasing Z₁ for the same-velocity projectile up to Z₁=8. Both the Z₁ and E₁ dependence of these intensities agree reasonably well with a theoretical model described elsewhere. Deviations of peak intensities from theory are discussed. Centroid energies of the peaks increase approximately linearly with Z₁ at a rate of {~}1 eV/Z. These energy shifts are compared with Hartree-Fock calculations of the x-ray energies for various members of M-shell (3s and 3p) electronic vacancies. Peak widths range from 10 to 37 eV, increasing monotonically with Z₁ for most peaks and increasing monotonically with n for all projectiles. No variation of centroid positions or peak widths was observed for different values of E₁ and fixed Z₁. The observed energy shifts and peak-width variations are discussed in terms of ionization of the M shell, varying distributions of L-shell vacancies among the $2s$ and $2p$ subshells, and possible multiplet splittings.