Raman spectra of CoF2 above and below its Néel point have been obtained which show four very weak lines in the region between 700 and 1500 cm−1. These are attributed to transitions from the ground state to the four highest-lying levels within the resolved Γ4+4 manifold of Co2+. The spectra are in good agreement with data for Co2+ in MgF2.

No abstract

No abstract

Polarized Raman studies of the three normal spinels Ag2MoO4, Co2GeO4, and ZnAl2O4 are reported. Electronic Raman scattering to levels of Co2+ in a surrounding of D3d symmetry is discussed and wave-functions of ground and excited states are given.

Electronic Raman transitions to levels of divalent cobalt and iron ions of the compounds CoF2, CozGe04 and FeFz, FezGe04 are discussed. From the position and wave functions of the low lying electronic levels it is possible to calculate the magnetic susceptibility of these compounds. Our calculations suggest that a reasonable agreement exists between the calculated value from the Raman spectra and the measured values of xrn as function of the temperature of the samples.