The Kα and Kβ x-ray spectra of palladium and lanthanum bombarded by 5.5-MeV/amu ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ ions were measured with a high-resolution transmission crystal spectrometer. The observed complex structure of the Kα${\mathit{L}}^0$ and K${\mathrm{\beta }}_{1,3}$${\mathit{L}}^0$ lines consisting of many M satellites was analyzed by means of theoretical line profiles based on multiconfiguration Dirac-Fock calculations. The average M-shell and M-subshell ionization probabilities in near-central collisions are determined. The experimental results are compared to the predictions of the semiclassical-approximation theory. The agreement is much improved by using Dirac-Hartree-Fock (DHF) wave functions instead of screened relativistic hydrogenic wave functions. The importance of DHF wave functions in the calculation of the M-shell ionization probabilities is illustrated with other examples.

• Received 26 August 1993

DOI:https://doi.org/10.1103/PhysRevA.49.2524