Spectral Intensities of Some Nd3+ β-Diketonates

The oscillator strengths of the absorption bands of Nd³⁺ acetylacetonate, benzoylacetonate, dibenzoylmethide, and thenoyltrifluoroacetonate in solvents (a) methanol, (b) methanol plus ethanol (1:3), (c) DMF, and (d) DMF plus solvent (b) (1:4) have been determined spectrophotometrically. The results are in remarkably good agreement with the theories of Judd. Only two parameters ${\tau }_4$ and ${\tau }_6$ are required to predict the oscillator strength of the absorption bands. In the case of hypersensitive transitions an additional parameter ${\tau }_2$ is necessary.