Electronic and vibrational Raman spectra of PrC l 3 and LaCl 3

Abstract
A search for electronic Raman transitions in the Pr3+ ion in PrCl3 has yielded ten lines, which have been assigned as transitions from the ground Stark level of the 3H4 state of the free Pr3+ ion to: (i) three other Stark levels of the 3H4 state ; (ii) five Stark levels of the 3H5 state ; and (iii) two Stark levels of the 3F2 state. The frequencies and the polarizations of these lines are in agreement with the known energy levels of the Pr3+ ion. During the course of this work the frequencies of five of the six Raman active vibrational modes of crystals of both PrCl3 and LaCl3 were also determined. Only one Ag mode escaped detection.

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