Abstract
High resolution measurements of the far-infrared lattice gap modes due to BH 4 − in KI are reported. The observed bands at 85.45 ± 0.05 and 84.94 ± 0.05 cm −1 are ascribed as resulting from the presence of two stable boron isotopes in the BH 4 − ion. The gap modes are calculated by allowing for the elastic relaxation of the lattice around the impurity. The results of a calculation for the Br − gap modes in KI are also presented.
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