Electronic spectrum of the manganate(V) ion

Abstract

The polarized electronic spectrum of MnO^3–₄ doped in crystals of Ca₂PO₄Cl has been measured at 4.2 K from 5000 to 40 000 cm^–1. From a careful examination of the possible excited states and of the lattice site-group perturbation, the four observed bands in the region 8000–24 000 cm^–1 are assigned as ligand field bands and the other two more intense beyond 24 000 cm^–1 are assigned as charge transfer. The assignments are supported by the observed polarizations and by ligand field calculations which give a good fit to the energies and the relative intensities.