Electronic absorption spectra of Mn²⁺ ion in Cd(NH<inf>4</inf>)<inf>2</inf>(SO<inf>4</inf>)<inf>2</inf> · 6H<inf>2</inf>O and CdK<inf>2</inf>(SO<inf>4</inf>)<inf>2</inf> · 6H<inf>2</inf>O single crystals

Electronic absorption spectra of Mn2+ ion in Cd(NH4)2(SO4)2 · 6H2O (CdASH) and CdK2(SO4)2 · 6H2O(CdKSH) crystals have been studied at room temperature (300 K) and low temperature (80 K) in the region 2500-6000 Å. The spectrum showed the characteristic features of Mn2+ ion in octahedral crystalline fields. Band positions have been calculated theoretically by solving the energy matrices corresponding to octahedral symmetry and compared with the experimentally observed band positions. The crystal field parameter (Dq), interelectronic repulsion parameters (B and C) and the Trees correction (α) have been fixed and also the crystal field transitions are assigned for the best fit of experimental and calculated band positions. The evaluated parameters for the above two lattices are: CdASH:Mn2+ Dq = 690 cm-1, B = 835 cm-1, C = 3011 cm-1, α = 76 cm-1. CdKSH:Mn2+ Dq = 740 cm-1, B = 857 cm-1, C = 2977 cm-1, α = 76 cm-1. © 1980.