Abstract
Optical absorption spectrum of nickel fluosilicate hexadeuterate studied at 300 and 80 K is reported. The splitting of one of the bands at liquid air temperature (80 K) has been explained as due to spin-orbit interaction. Four of the additional bands observed at 80 K have been successfully explained as those belonging to OH and OD molecules. The observed ligand field bands have been interpreted as those of Ni 2+ in octahedral field coupled with a small trigonal field. The crystal field parameters derived are B = 875 cm −1 , C = 3062.5 cm −1 , Dq = 960 cm −1 and ξ = 600 cm −1 .
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