Spectral intensities of U3+ ions doped in LaCl3 single crystals

A high resolution absorption spectrum of a U3+(0.25%):LaCl3 single crystal was recorded in the 4000–30000cm−1 range at room temperature. Intensity calculations based on the Judd-Ofelt theory gave good agreement with experimental data provided some of the L'S ‘J’ band areas were combined. In order to check the correctness of the calculations, the obtained Ω λ intensity parameters have been used for the determination of transition probabilities and these in turn for calculations of radiative lifetimes.