K-shell ionization of elementsP15toNi28for 0.4 to 3.8 MeV/amuB510-ion bombardment

$K$-shell x-ray production cross sections, $\frac{K\beta }{K\alpha }$ x-ray intensity ratios and $K\alpha$ and $K\beta$ x-ray energy shifts have been determined for thin solid targets of ${}_{15}{}^{}{}_{}{}^{}\mathrm{P}$, ${}_{19}{}^{}{}_{}{}^{}\mathrm{K}$, ${}_{20}{}^{}{}_{}{}^{}\mathrm{Ca}$, ${}_{21}{}^{}{}_{}{}^{}\mathrm{Sc}$, ${}_{22}{}^{}{}_{}{}^{}\mathrm{Ti}$, ${}_{23}{}^{}{}_{}{}^{}\mathrm{V}$, ${}_{25}{}^{}{}_{}{}^{}\mathrm{Mn}$, ${}_{26}{}^{}{}_{}{}^{}\mathrm{Fe}$, ${}_{27}{}^{}{}_{}{}^{}\mathrm{Co}$, and ${}_{28}{}^{}{}_{}{}^{}\mathrm{Ni}$ for 4-38-MeV ${}_5{}^{10}{}_{}{}^{}\mathrm{B}$ ion bombardment. Comparisons of the cross sections were made to direct Coulomb ionization and electron-capture theories by means of fluorescence yields corrected for multiple-ionization effects. The dominant contribution to $K$-vacancy production for these projectile-target combinations is believed to be direct ionization. Electron capture is expected to be important only for the lighter target elements and then primarily at the higher velocities. The direct-ionization theories employed were the binary-encounter approximation and the plane-wave Born approximation (PWBA) both of which overestimated the experimental data especially at the lower incident ion velocities. The PWBA was modified for increased target-electron binding, Coulomb deflection of the incident ion, polarization of the target-electron wave functions due to the passage of the incident ion, and relativistic target-electron velocities. The experimental data were found to agree quite well with the sum of the theoretical predictions of the modified PWBA and electron capture.