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L-subshell ionization cross sections of Au and Bi induced by C"+ and 0'+ ions have been measured for impact energies ranging from 0.25 to 0.79 MeV/u. The data have been compared with the predictions of the ECPSSR [perturbed-stationary-state (PSS) theory with energy-loss (E), Coulomb deflection (C), and relativistic corrections (R)] theory. Reasonable agreement between theory and experiment is observed for the L&(2s&&2) and L3(2p3/2) subshells. For the L&(2p&z&) subshell, however, large disagreement between the data and the ECPSSR predictions persists. This difference could be due to the "collision-induced intrashell" mechanism that was suggested by Sarkadi and Mukoyama [J. Phys. B 14, L255 (1981)].PACS number(s): 34.50.Fa

Elastic scattering cross sections of 22.1-keV x rays by the elements Ti, V, Fe, Ni, Cu, Zn, Zr, Nb, Mo, Pd, Cd, In, Sn, Sm, Gd, Dy, Er, Yb, Au, and Pb have been measured at 90°with an overall error of 8 -10 %. The 22.1-keV x rays were obtained from a Ag foil used as a secondary target in an x-ray fluorescence setup. Experimental cross sections have been compared with the nonrelativistic form factors ͑NFF͒, relativistic form factors, modified relativistic form factor ͑MRFF͒, relativistic form factor with anomalous scattering correction ͑RFFASF͒, modified relativistic form factor with anomalous scattering correction ͑MRFFASF͒, and the S matrix calculations. For low Z elements, experimental values are better represented by S matrix, RFFASF, and MRFFASF. For the elements Nb, Mo, and Pd whose K shell binding energies are very close to the exciting energy, the data are higher than all of the theoretical predictions. For higher Z elements, NFF and MRFF give a better agreement with the present data.

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