Spectra of the Ironlike Ions from Y XIV to Ag XXII

The spectra of the ironlike ions Y XIV, Zr XV, Nb XVI, Mo XVII, Ru XIX, Rh XX, Pd XXI and Ag XXII emitted by low inductance vacuum sparks have been observed in the range 25-90 Å. More than 440 lines have been identified for the first time as 3p⁶3d ⁸-3p53d ⁹ and 3p ⁶3d ⁸-3p ⁶3d ⁷4p transitions. Three parametric interpretations of the whole isolectronic sequence of energy levels have been performed for 3d ⁸, 3p ⁵3d ⁹ and 3d ⁷4p respectively. This has led to an accurate determination of scaling factors for the Slater and spin-orbit integrals calculated by the Hartree-Fock method. Predicted wavelengths and line strengths are given for Sr XIII.