Crystal field and spectrum of Pr4+ in BaPrO3

We have measured the absorption spectrum of BaPrO₃ in the spectral range 1900–11000 cm^?1. All the energy levels of the 4f electronic configuration of the Pr⁴⁺ ion in a crystal have been observed for the first time. We describe the total set of electron-nuclear states and the integral intensities of the magnetic dipole transitions of the Pr⁴⁺ in BaPrO₃ in the framework of the crystal field approximation. The crystal field parameters corresponding to the real orthorhombic symmetry of BaPrO₃ are obtained with the exchange charge model.