2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/174338Photoionization of the I$^+$ ion in the energy range of the 4d giant resonance has been studied using our recently developed random-phase approximation with exchange (RPAE) method. Photoionization cross sections for the I$^+$ $4d-εf, εp$, $5s-εp$, $5p-εs ,εd$ have been obtained for each term of the ground state. Calculations include all the intra-shell and inter-shell coupling among the 4d, $5s$, and $5p$ subshells. Our maximum cross section for the I$^+$ 4d giant resonance, 23.12 MB at 90.24 eV agrees excellently with the recent measurement, 23(3) at 90 eV.8 page 5 figuresAtomic Physicstext