Crystal-Field Term Symbols for Nd3+ in CaWO4

The crystal‐field term symbols for the ${}^4{F}_{\frac{3}{2}}$ state and the three lowest ⁴I states of Nd³⁺ in CaWO₄ are identified with the irreducible representations of the double group of S₄ symmetry. The assignments were made after an analysis of the polarized fluorescence of Nd³⁺ in CaWO₄ compensated by Na⁺. The selection rules corresponding to electric‐dipole transitions were applied after establishing the multipolarity through polarized absorption.