Absorption Spectrum of Nd3+ in LaBr3

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Abstract
The absorption spectrum of 0.5 mole % Nd3+ in a LaBr3 single crystal was obtained and most of the crystalline field Stark levels identified. The spectrum is very similar to that obtained from Nd3+ in LaCl3 and, in fact, the crystalline field parameters that fit LaCl3 to 5 cm—1 fit LaBr3 to 7 cm—1. The major difference in the two spectra is a general shift of levels to the red in the LaBr3. This is similar to the spectra of Pr3+ in the two crystals discussed previously [E. Y. Wong and I. Richman, J. Chem. Phys. 36, 1889 (1962)]. The explanation for this shift in both Pr3+ and Nd3+ spectra is probably the same.