Interfacial vibrational modes (IFM’s) of CdSe/ZnTe superlattice are shown for perfect and atomically rearranged interfaces with four probable exchange configurations. In addition to the IFM at $222{\mathrm{cm}}^{\mathrm{-}1}$ originating from single interface Zn-Se “wrong” bonds (WB’s), another IFM at $235{\mathrm{cm}}^{\mathrm{-}1}$ occurs due to atomic rearrangement at the interfaces, which is attributed to double Zn-Se WB’s. Raman scattering on both atomic-layer-epitaxy and molecular-beam-epitaxy grown samples is reported. Using the experimental data for the $218{\mathrm{cm}}^{\mathrm{-}1}$ line of LIF as a base for improving calculations, the corresponding ${\mathrm{LIF}}_2$ line is predicted at $228{\mathrm{cm}}^{\mathrm{-}1}.$ Experiments failed to detect this line owing to insufficient double WB’s with long-range order. This characteristic IFM is observed in an annealed sample, with abnormally strong intensity at $227{\mathrm{cm}}^{\mathrm{-}1}.$

• Received 3 February 1997

DOI:https://doi.org/10.1103/PhysRevB.57.1637