Abstract
We report a detailed analysis of the free ion centers of gravity and the crystalline electric field (CEF) splitting of the 4£ 12[ SL]- J levels of Tm 3+ in single crystals of Tm 2(SO 4) 3·8H 2O. A new interpretation of the 3P 0 and 1l 6 centers of gravity in the sulfate lattice is given. A free ion calculation has been completed and the resulting intermediately coupled wavefunctions have been used to calculate the CEF splitting. Forty-three observed crystalline Stark level differences were used in the CEF analysis and could be accounted for to better than 5%. The CEF parameters are found to be very similar to those previously reported for Ho 3+ in single crystals of Ho 2(SO 4) 3·8H 2O. The CEF splitting calculation predicts the presence of a pair of nearly twofold degenerate ground levels and the respective spectroscopic splitting factors in agreement with experiment.
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