Photoionization of atomic iodine and its ions - art. no. 020701

Calculations of the photoionization cross section for the atomic iodine ato m and its ions I- and I2+ using the random-phase approximation with exchang e are performed in a broad photon energy range from 40 to 136 eV. A signifi cant (factor of 3) difference between recent experimental data and our theo retical results is found in the region dominated by the giant resonance fro m the 4d subshells. Sum-rule analysis suggests that the experimental situat ion requires reexamination.