Interpretation of the light scattering spectrum of paramagnetic FeF2

The Raman spectrum of a single crystal of FeF₂ is reported and the transitions in the range of 900–1500 cm^?1 are assigned to the spin-orbit levels of the Fe²⁺ ion in a field of D_2h symmetry. The value of the tetragonal and rhombic distortion parameters calculated from the spectra are ?1162 cm^?1 and 110 cm^?1, respectively and the spin-orbit coupling parameter λ = ?91.3 cm^?1. The computed energy level diagram is in agreement with the EPR spectrum of this compound.