Knowledge Bank

“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 $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}H4$ state of the free $Pr3+$ inn to; (i) three other Stark levels 01 the $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}H4$ state; (ii) rive Stark levels of the $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}H4$ state; and (iii) two Stark levels of the $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}F2$ 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 (one $Ag$, one $E1g$, three $E2g$) of the six Raman-active vibrational modes of crystals of both and $PrCl3$ and $LaCl3$ were also determined. Only une $Ag$ mode escaped detection.”