Abstract
A search for electronic Raman transitions in the Pr
3+
ion in PrCl
3
has yielded ten lines, which have been assigned as transitions from the ground Stark level of the
3
H
4
state of the free Pr
3
+ ion to: (i) three other Stark levels of the
3
H
4
state ; (ii) five Stark levels of the
3
H
5
state ; and (iii) two Stark levels of the
3
F
2
state. The frequencies and the polarizations of these lines are in agreement with the known energy levels of the Pr
3+
ion. During the course of this work the frequencies of five of the six Raman active vibrational modes of crystals of both PrCl
3
and LaCl
3
were also determined. Only one
A
g
mode escaped detection.
Reference3 articles.
1. B ethe H . 1929 A n n . P hys.
2. B ru n etti R . & Ollano Z. 1931 N uovo Cim. 8 281.
3. B ru n etti R . & Ollano Z. 1932 L pz. 3 133.
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