SPECTROSCOPIC STUDY OF CRYSTALLINE ND2O2S OPTICAL-ABSORPTION MEASUREMENTS, CRYSTAL-FIELD ANALYSIS AND INTENSITY CALCULATIONS

Room temperature and low temperature optical absorption measurements a re performed on Nd2O2S in crystal and powder form. The experimental os cillator strengths are deduced and compared with calculations at 8 and 300 K including the contribution of Judd-Ofelt and Jorgensen-Judd mec hanisms. The global oscillator strengths are satisfactorily reproduced by considering the sum of both contributions but the relative intensi ties of the strong transitions are best reproduced by the Jorgensen-Ju dd mechanism alone.