Depolarization of Raman Scattering in LaCl3

The first-order Raman spectrum of La${\mathrm{Cl}}_3$ is reexamined. Consideration of depolarization of the Raman scattering from the totally symmetric $A_g$ vibration has led to a different assignment for the Raman-active lines: 108 ${\mathrm{cm}}^{-1\mathrm{}}$, $E_{2g}$; 180 ${\mathrm{cm}}^{-1\mathrm{}}$, $A_g$; 186 ${\mathrm{cm}}^{-1\mathrm{}}$, $E_{1g}$; 212 ${\mathrm{cm}}^{-1\mathrm{}}$, $A_g$; 219 ${\mathrm{cm}}^{-1\mathrm{}}$, $E_{2g}$. The depolarization scattering appears to result from optic axis wandering in the crystal as well as from converging or diverging light beams.