The Raman effect in zinc oxide has been measured using the continuous helium-neon and ionized argon lasers as sources. The frequency and symmetry character of the fundamental modes have been determined. The results are: two $E_2$ vibrations at 101 and 437 ${\mathrm{cm}}^{-1\mathrm{}}$; one transverse $A_1$ at 381 ${\mathrm{cm}}^{-1\mathrm{}}$ and one transverse $E_1$ at 407 ${\mathrm{cm}}^{-1\mathrm{}}$; one longitudinal $A_1$ at 574 ${\mathrm{cm}}^{-1\mathrm{}}$ and one longitudinal $E_1$ at 583 ${\mathrm{cm}}^{-1\mathrm{}}$.

• Received 8 September 1965

DOI:https://doi.org/10.1103/PhysRev.142.570