Abstract
The optical absorption spectrum of Ni 2+ ion in otwayite crystal has been studied at room and liquid nitrogen temperatures. From the nature and positions of the observed bands a successful interpretation of all the bands could be made assuming octahedral symmetry for the Ni 2+ ion in the crystal. The splittings observed for the 3T 1g(F) band at liquid nitrogen temperature have been interpreted due to spin-orbit interaction. The observed band positions in the crystal have been fitted with four parameters B, C Dq and ξ. NIR and IR spectra of the otwayite sample are presented. The fundamental vibrational modes of H 2O and CO 2- 3 ion are identified in the IR region. The bands observed in NIR spectrum are due to overtones and combination tones of water and carbonate ion.
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