ABSORPTION-SPECTRA OF CO(II) IONS DOPED IN MAGNESIUM THALLIUM SULFATEHEXAHYDRATE

The optical obsorption spectrum of Co(II) ions doped in magnesium thal lium sulphate hexahydrate is studied at room and liquid nitrogen tempe ratures. The crystal exhibits characteristic absorption of the Co(II) ion in the visible and near infrared. The observed bands are assigned to transitions from the ground state T-4(1g) (F) to various excited qu artet and doublet levels of the Co(II) ion in octahedral symmetry. The splitting of one of the bands at liquid nitrogen temperature is expla ined to be due to spin-orbit splitting. All band positions have been f itted by the parameters B, C, Dq and xi.