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An analysis is made of the transferability of frozen core potentials of neutral lanthanide and actinide elements to 4f=5f and 5d=6d states of their respective 3þ and 4þ ions. A good description of the orbital spin-orbit coupling constants 4f = 5f and 5d = 6d of the Ln 3þ / An 4þ ions and of the 4f ! 5d=5f ! 6d transition energies is achieved by using [Kr]/[Xe, 4f] cores. The corresponding relativistic core ab initio model potentials (AIMPs) based on Cowan-Griffin atomic calculations, togetherdoi:10.1080/00268970210158740 fatcat:s5tex2gi6jea5en4co7ghdtl4q