The photoabsorption of Eu, Eu+ and Eu2+ in the vicinity of 4d thresholds

The results of calculations of the total and partial photoionisation cross- sections of neutral Europium and its ions in the photon energy range from t he threshold up to 270 eV are presented. The calculations were performed wi thin the multi-channel Spin-Polarized Random Phase Approximation with Excha nge. The main attention is given to the giant autoionizing resonance associ ated with the 4d --> df discrete transition to vacant states in the 4f(7) s ubshell. The comparisons with experimental data obtained recently and the r esults of previous calculations are made. (C) 2000 Elsevier Science Ltd. Al l rights reserved.