We have obtained the resonance Raman spectrum of ${\mathrm{ZrS}}_2$ and ${\mathrm{HfS}}_2$ using krypton- and argon-ion laser lines. The resonating electronic transition is the $L_2^{\mathrm{-}}$ to $L_1^{+}$ transition, which we determine to occur at 2.47±0.05 eV in ${\mathrm{ZrS}}_2$. We have observed the $E_u$(LO) mode in ${\mathrm{ZrS}}_2$ at 350±5 ${\mathrm{cm}}^{\mathrm{-}1}$ and also its second-order spectrum. In the case of ${\mathrm{HfS}}_2$, we have observed the $A_{2u}$(LO) mode at 325±2 ${\mathrm{cm}}^{\mathrm{-}1}$ and a second-order spectrum in the region of 570–660 ${\mathrm{cm}}^{\mathrm{-}1}$. The phonon structure of both materials is presented.

• Received 11 May 1987

DOI:https://doi.org/10.1103/PhysRevB.37.6808