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Lanthanide elements play important roles as an opacity source in the ejectedmaterial from neutron star mergers. Accurate and complete atomic data arenecessary to evaluate the opacities and to analyze the observed data. In thispaper, we perform extended, ab-initio atomic calculations from Pr II (Z=59) toGd II (Z=64). By using multiconfiguration Dirac-Hartree-Fock and relativisticconfiguration-interaction methods, implemented in the general-purposerelativistic atomic structure package GRASP2K, we calculate the energy levelsand transition data of electric dipole transitions. These computations arebased on strategies (with small variations) of Nd II published by Gaigalas etal. (2019). Accuracy of data is evaluated by comparing computed energy levelswith the NIST database or other works. For the energy levels, we obtain theaverage relative accuracy of 8%, 12%, 6%, 8%, and 7% for Pr II, Pm II, Sm II,Eu II, and Gd II ions, respectively as compared with the NIST data. Accuracy ofenergy transfer to the wavelength as 3%, 14% and 11% for Pr II, Eu II and GdII. Our computed E1 type transition probabilities are in good agreement withexperimental values presented by other authors especially for strongtransitions.

Extended calculations of energy levels and transition rates for singly ionized lanthanide elements I: Pr - Gd